Interval οf credit scοres that are οne standard deviatiοn arοund the mean is (673,753),
What is standard deviatiοn?Standard Deviatiοn is a measure which shοws hοw much variatiοn (such as spread, dispersiοn, spread,) frοm the mean exists. The standard deviatiοn indicates a “typical” deviatiοn frοm the mean. It is a pοpular measure οf variability because it returns tο the οriginal units οf measure οf the data set. Like the variance, if the data pοints are clοse tο the mean, there is a small variatiοn whereas the data pοints are highly spread οut frοm the mean, then it has a high variance. Standard deviatiοn calculates the extent tο which the values differ frοm the average.
Let x denοte credit wοrthiness
[tex]$$ x \sim N(\mu=713, \sigma=40) $$[/tex]
a) Interval οf credit scοres that are οne standard deviatiοn arοund the mean is
[tex]$$ \begin{aligned} & =\mu \pm \sigma \\ & =713 \pm 40 \\ & =713-40,713+40 \\ & =(673,753) \end{aligned} $$[/tex]
Thus, Interval οf credit scοres that are οne standard deviatiοn arοund the mean is (673,753),
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11 please
(11]. For the power series ġ (4-3) " find the interval of convergence
The interval of convergence for the power series is -2 to 8, excluding the endpoints.
To find the interval of convergence of the power series ∑ n=2 to ∞ ([tex](x - 3)^n[/tex]/n[tex]5^n[/tex]), we can use the ratio test.
Applying the ratio test, we have lim (n→∞)|[tex](x - 3)^{(n+1)}[/tex]/(n+1)[tex]5^{(n+1)}[/tex]| / |[tex](x - 3)^n[/tex]/n[tex]5^n[/tex]|. Simplifying this expression, we get |x - 3|/5.
For the series to converge, the absolute value of this expression must be less than 1.
Therefore, |x - 3|/5 < 1, which implies -5 < x - 3 < 5. Solving for x, we find -2 < x < 8.
Therefore, the interval of convergence for the power series is -2 < x < 8.
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The question is -
For the Power series ∑ n=2 to n ((x - 3)^n/n5^n). Find the interval of convergence.
The point TL TT in the spherical coordinate system represents the point TC in the cylindrical coordinate system. Select one: True False
The statement is false. The point TL TT in the spherical coordinate system does not represent the same point as the point TC in the cylindrical coordinate system.
The spherical coordinate system and the cylindrical coordinate system are two different coordinate systems used to represent points in three-dimensional space.
In the spherical coordinate system, a point is represented by its radial distance from the origin (r), the angle made with the positive z-axis (θ), and the angle made with the positive x-axis in the xy-plane (ϕ).
In the cylindrical coordinate system, a point is represented by its distance from the z-axis (ρ), the angle made with the positive x-axis in the xy-plane (θ), and its height along the z-axis (z). The coordinates are usually denoted as (ρ, θ, z).
Comparing the coordinates, we can see that the radial distance in the spherical coordinate system (r) is not equivalent to the distance from the z-axis in the cylindrical coordinate system (ρ).
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If sin 2x = 1/2 and you're thinking of the argument, 2x, as an
angle in standard position in the plane.
Which quadrants could the terminal side of the angle be
in?
What would the reference angle be? (
b) If sin 2x = - and you're thinking of the argument, 2x, as an angle in standard position in the plane. Which quadrants could the terminal side of the angle be in? What would the reference angle be?
a) If sin 2x = 1/2, we can determine the possible quadrants for the terminal side of the angle by considering the positive value of sin.
Since sin is positive in Quadrant I and Quadrant II, the terminal side of the angle can be in either of these two quadrants.
To find the reference angle, we can use the fact that sin is positive in Quadrant I. The reference angle is the angle between the terminal side of the angle and the x-axis in Quadrant I. Since sin is equal to 1/2, the reference angle is π/6 or 30 degrees.
b) If sin 2x = -, we can determine the possible quadrants for the terminal side of the angle by considering the negative value of sin. Since sin is negative in Quadrant III and Quadrant IV, the terminal side of the angle can be in either of these two quadrants.
To find the reference angle, we can use the fact that sin is negative in Quadrant III. The reference angle is the angle between the terminal side of the angle and the x-axis in Quadrant III. Since sin is equal to -1, the reference angle is π/2 or 90 degrees.
In summary, for sin 2x = 1/2, the terminal side of the angle can be in Quadrant I or Quadrant II, and the reference angle is π/6 or 30 degrees. For sin 2x = -, the terminal side of the angle can be in Quadrant III or Quadrant IV, and the reference angle is π/2 or 90 degrees.
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Find the scale factor of the dilation with center at C(-5,6) if the image of point P(1,2) is the point P(-2, 4).
The scale factor of the dilation with center at C (-5, 6) if the image of point P(1, 2) is the point P(-2, 4) is [tex]1/\sqrt{13}[/tex].
To compare the sizes of two comparable objects or figures, mathematicians employ the idea of scale factors. The ratio of any two corresponding lengths in the objects is what it represents.
By dividing the length of a corresponding side or dimension in the bigger object by the length of a similar side or dimension in the smaller object, the scale factor is determined. It can be used to scale an object up or down while keeping its proportions. The larger object is twice as large as the smaller one in all dimensions, for instance, if the scale factor is 2.
The formula to find the scale factor is as follows: Scale factor = Image length ÷ Object length.
To calculate the scale factor, use the x-coordinates of the image and object points:
[tex]$$\text{Scale factor = }\frac{image\ length}{object\ length}$$$$\text{Scale factor = }\frac{CP'}{CP}$$[/tex]
Where CP and CP' are the distances between the center of dilation and the object and image points, respectively.
According to the problem statement, Point P (1,2) is the object point, and point P' (-2, 4) is the image point.Therefore, the distance between CP and CP' is as follows:
[tex]$$\begin{aligned} CP &=\sqrt{(1-(-5))^2+(2-6)^2} \\ &= \sqrt{(1+5)^2 + (2-6)^2}\\ &= \sqrt{(6)^2 + (-4)^2}\\ &= \sqrt{36+16}\\ &= \sqrt{52}\\ &= 2\sqrt{13} \end{aligned}$$[/tex]
Similarly, we will calculate CP':$$\begin{aligned} CP' &= \sqrt{(4-6)^2+(-2+2)^2} \\ &= \sqrt{(-2)^2 + (0)^2}\\ &= \sqrt{4}\\ &= 2 \end{aligned}$$
Therefore, the scale factor is: [tex]$$\begin{aligned} \text{Scale factor} &=\frac{CP'}{CP}\\ &= \frac{2}{2\sqrt{13}}\\ &= \frac{1}{\sqrt{13}} \end{aligned}$$[/tex]
Hence, the scale factor is [tex]1/\sqrt{13}[/tex].
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Find the directional derivative of the following function at the point (2,1,1) in the direction of the vector ū= (1,1,1). f(x, y, z) = xy2 tan- 2
To find the directional derivative of the function f(x, y, z) = xy^2 tan^(-2) at the point (2, 1, 1) in the direction of the vector ū = (1, 1, 1), we can use the formula:
D_ūf(x, y, z) = ∇f(x, y, z) · ū,
where ∇f(x, y, z) is the gradient of f(x, y, z) and · denotes the dot product.
First, let's compute the gradient of f(x, y, z):
∇f(x, y, z) = (∂f/∂x, ∂f/∂y, ∂f/∂z).
Taking the partial derivatives of f(x, y, z) with respect to each variable, we have:
∂f/∂x = y² tan[tex]^{(-2)}[/tex],
∂f/∂y = 2xy tan[tex]^{(-2)}[/tex],
∂f/∂z = 0.
Therefore, the gradient of f(x, y, z) is:
∇f(x, y, z) = (y² tan[tex]^{(-2)},[/tex] 2xy tan[tex]^{(-2)}[/tex], 0).
Next, we need to calculate the dot product between the gradient and the direction vector ū: ∇f(x, y, z) · ū =
∇f(x, y, z) · ū = [tex]= (y^2 tan^(-2), 2xy tan^(-2), 0) (1, 1, 1)\\ = y^2 tan^(-2) + 2xy tan^(-2) + 0\\ = y^2 tan^(-2) + 2xy tan^(-2).[/tex]
Substituting the point (2, 1, 1) into the expression, we get:
∇f(2, 1, 1) · ū =[tex]= (1^2 tan^(-2) + 2(2)(1) tan^(-2)\\ = (1 tan^(-2) + 4 tan^(-2)\\ = 5 tan^(-2).[/tex]
Therefore, the directional derivative of f(x, y, z) at the point (2, 1, 1) in the direction of the vector ū = (1, 1, 1) is 5 tan[tex]^{(-2)[/tex].
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Decide if n=1 (-1)" Vn converges absolutely, conditionally or diverges. Show a clear and logical argument.
Without knowing the convergence behavior of the series ∑|Vn|, we cannot definitively determine whether the series ∑((-1)^n * Vn) converges absolutely, conditionally, or diverges.
To determine if the series ∑((-1)^n * Vn) converges absolutely, conditionally, or diverges, we need to analyze the behavior of the individual terms and the overall series.
First, let's examine the terms: (-1)^n and Vn. The term (-1)^n alternates between -1 and 1 as n increases, while Vn represents a sequence of real numbers.
Next, we consider the absolute value of each term: |(-1)^n * Vn| = |(-1)^n| * |Vn| = |Vn|.
Now, if the series ∑|Vn| converges, it implies that the series ∑((-1)^n * Vn) converges absolutely. On the other hand, if ∑|Vn| diverges, we need to examine the behavior of the series ∑((-1)^n * Vn) further to determine if it converges conditionally or diverges.
Therefore, the convergence of the series ∑((-1)^n * Vn) is dependent on the convergence of the series ∑|Vn|. If ∑|Vn| converges, the series ∑((-1)^n * Vn) converges absolutely. If ∑|Vn| diverges, we cannot determine the convergence of ∑((-1)^n * Vn) without additional information.
In conclusion, without knowing the convergence behavior of the series ∑|Vn|, we cannot definitively determine whether the series ∑((-1)^n * Vn) converges absolutely, conditionally, or diverges.
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Is it true or false?
Any conditionally convergent series can be rearranged to give any sum. O True False
False. It is not true that any conditionally convergent series can be rearranged to give any sum.
The statement is known as the Riemann rearrangement theorem, which states that for a conditionally convergent series, it is possible to rearrange the terms in such a way that the sum can be made to converge to any desired value, including infinity or negative infinity. However, this theorem comes with an important caveat. While it is true that the terms can be rearranged to give any desired sum, it does not mean that every possible rearrangement will converge to a specific sum. In fact, the Riemann rearrangement theorem demonstrates that conditionally convergent series can exhibit highly non-intuitive behavior. By rearranging the terms, it is possible to make the series diverge or converge to any value. This result challenges our intuition about series and highlights the importance of the order in which the terms are summed. Therefore, the statement that any conditionally convergent series can be rearranged to give any sum is false. The Riemann rearrangement theorem shows that while it is possible to rearrange the terms to achieve specific sums, not all rearrangements will result in convergence to a specific value.
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Let f(a) = 3r* - 36x + 3 Input the interval() on which fis increasing Find the absolute maximum and minimum values of the following function on the given interval. If there are multiple points in a single category list the points in increasing order in x value and enter N in any blank that you don't need to use. Input the interval(s) on which f is decreasing. f(x) = 8xe*, 0,2 Absolute maxima X= y = Find the point(s) at which f achieves a local maximum X= y = Find the point(s) at which f achieves a local minimum X= y = Find the intervals on which fis concave up. Absolute minima x = Find the intervals on which f is concave down. X Find all inflection points. X= y =
The absolute maximum value is approximately 93.70 at x = 2,the absolute minimum value is approximately -2.31 at x = -1,the function is concave up on the interval (-1, ∞),the function is concave down on the interval (-∞, -1),the inflection point is (-1, f(-1)).
To find the intervals on which the function f(x) = 8xe^x is increasing and decreasing, we need to analyze the sign of its derivative.
First, let's find the derivative of f(x):
f'(x) = (8x)'e^x + 8x(e^x)'
= 8e^x + 8xe^x
= 8(1 + x)e^x
To determine where f(x) is increasing or decreasing, we need to find where f'(x) > 0 (increasing) and where f'(x) < 0 (decreasing).
Setting f'(x) > 0:
8(1 + x)e^x > 0
Since e^x is always positive, we can disregard it. So, we have:
1 + x > 0
Solving for x, we find x > -1.
Thus, f(x) is increasing on the interval (-1, ∞).
To find the absolute maximum and minimum values of f(x) = 8xe^x on the interval [0,2], we evaluate the function at the critical points and endpoints.
Endpoints:
f(0) = 8(0)e^0 = 0
f(2) = 8(2)e^2 ≈ 93.70
Critical points (where f'(x) = 0):
8(1 + x)e^x = 0
1 + x = 0
x = -1
So, the critical point is (-1, f(-1)).
Comparing the values:
f(0) = 0
f(2) ≈ 93.70
f(-1) ≈ -2.31
The absolute maximum value is approximately 93.70 at x = 2, and the absolute minimum value is approximately -2.31 at x = -1.
Next, let's determine the intervals on which f(x) is concave up and concave down.
Second derivative of f(x):
f''(x) = (8(1 + x)e^x)'
= 8e^x + 8(1 + x)e^x
= 8e^x(1 + 1 + x)
= 16e^x(1 + x)
To find where f(x) is concave up, we need f''(x) > 0.
Setting f''(x) > 0:
16e^x(1 + x) > 0
Since e^x is always positive, we can disregard it. So, we have:
1 + x > 0
Solving for x, we find x > -1.
Thus, f(x) is concave up on the interval (-1, ∞).
To find where f(x) is concave down, we need f''(x) < 0.
Setting f''(x) < 0:
16e^x(1 + x) < 0
Again, we disregard e^x, so we have:
1 + x < 0
Solving for x, we find x < -1.
Thus, f(x) is concave down on the interval (-∞, -1).
Lastly, let's find the inflection points by setting f''(x) = 0:
16e^x(1 + x) = 0
Since e^x is always positive, we have:
1 + x = 0
Solving for x, we find x = -1.
Therefore, the inflection point is (-1, f(-1)).
To summarize:
- The function f(x) =
8xe^x is increasing on the interval (-1, ∞).
- The absolute maximum value is approximately 93.70 at x = 2.
- The absolute minimum value is approximately -2.31 at x = -1.
- The function is concave up on the interval (-1, ∞).
- The function is concave down on the interval (-∞, -1).
- The inflection point is (-1, f(-1)).
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Rule 1: Multiply by 5 starting from 1. Rule 2: Add 4 starting from 10. Select the option that correctly shows the first 5 terms of each sequence.
a
First sequence: 0, 1, 5, 25, 125 and second sequence: 10, 14, 18, 22, 26
b
First sequence: 1, 5, 25, 125, 625 and second sequence: 0, 10, 14, 18, 22
c
First sequence: 1, 5, 25, 125, 625 and second sequence: 10, 14, 18, 22, 26
d
First sequence: 1, 3, 9, 27, 81 and second sequence: 10, 15, 20, 25, 30
Option c correctly represents the first 5 terms of each sequence according to the given rules.
Based on the given rules, the correct option that shows the first 5 terms of each sequence is:
c
First sequence: 1, 5, 25, 125, 625
Second sequence: 10, 14, 18, 22, 26
In the first sequence, each term is obtained by multiplying the previous term by 5, starting from 1. This gives us the terms 1, 5, 25, 125, and 625.
In the second sequence, each term is obtained by adding 4 to the previous term, starting from 10. This gives us the terms 10, 14, 18, 22, and 26.
Therefore, option c correctly represents the first 5 terms of each sequence according to the given rules.
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1. Find the derivative. 5 a) f(x) = 3V+ - 70 - 1 b) f(a) = 22 - 2 32 +1
The derivative of the function f(x) = 3V+ - 70 - 1 is 0, and the derivative of the function f(a) = 22 - 2 32 + 1 is 0.
To calculate the derivatives of the given functions:
a) For the function f(x) = 3V+ - 70 - 1, the derivative with respect to x is 0. Since the function does not contain any variables, the derivative is constant, and its value is 0.
b) For the function f(a) = 22 - 2 32 + 1, the derivative with respect to a is also 0. This is because the function does not contain any variable terms; it only consists of constants. The derivative of a constant is always 0.
Therefore, for both functions, the derivatives are equal to 0.
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Which angle are adjacent
to each other ?
Find yx and 2yx2 at the given point without eliminating the
parameter. x=133+7, y=144+8, =2. yx= 2yx2=
To find yx and 2yx2 at the given point without eliminating the parameter, we substitution the given values of x and y into the expressions.Therefore, yx = 8/7 and 2yx2 = 5929600 at the given point.
Given:
x = 133 + 7
y = 144 + 8
θ = 2
To find yx, we differentiate y with respect to x:
yx = dy/dx
Substituting the given values:
[tex]yx = (dy/dθ) / (dx/dθ) = (8) / (7) = 8/7[/tex]
To find 2yx2, we substitute the given values of x and y into the expression:
[tex]2yx2 = 2(144 + 8)(133 + 7)^2 = 2(152)(140^2) = 2(152)(19600) = 5929600.[/tex]
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a turn consists of rolling a standard die and tossing a fair coin. the game is won when the die shows a or a and the coin shows heads. what is the probability the game will be won before the fourth turn? express your answer as a common fraction.
The probability of winning the game before the fourth turn is [tex]\frac{19}{54}[/tex].
What is probability?
Probability is a measure or quantification of the likelihood or chance of an event occurring. It is a numerical value between 0 and 1, where 0 represents an event that is impossible to occur, and 1 represents an event that is certain to occur. The probability of an event can be determined by dividing the number of favorable outcomes by the total number of possible outcomes.
To find the probability of winning the game before the fourth turn, we need to calculate the probability of winning on the first, second, or third turn and then add them together.
On each turn, rolling a standard die has 6 equally likely outcomes (numbers 1 to 6), and tossing a fair coin has 2 equally likely outcomes (heads or tails).
1.Probability of winning on the first turn: To win on the first turn, we need the die to show a 1 or a 6, and the coin to show heads. Probability of rolling a 1 or 6 on the die: [tex]\frac{2}{6} =\frac{1}{3}[/tex]
Probability of tossing heads on the coin: [tex]\frac{1}{2}[/tex]
Therefore, probability of winning on the first turn: [tex]\frac{1}{3} *\frac{1}{2}[/tex] = [tex]\frac{1}{6}[/tex]
2.Probability of winning on the second turn: To win on the second turn, we either win on the first turn or fail on the first turn and win on the second turn. Probability of winning on the second turn, given that we didn't win on the first turn:
[tex]\frac{2}{3} *\frac{1}{3} *\frac{1}{2} \\=\frac{1}{9}[/tex]
3.Probability of winning on the third turn:
To win on the third turn, we either win on the first or second turn or fail on both the first and second turns and win on the third turn. Probability of winning on the third turn, given that we didn't win on the first or second turn:
[tex]\frac{2}{3} *\frac{2}{3} *\frac{1}{3} \\=\frac{2}{27}[/tex]
Now, we can add the probabilities together:
Probability of winning before the fourth turn =
[tex]\frac{1}{6}+\frac{1}{9}+\frac{2}{27}\\\\=\frac{9}{54}+\frac{6}{54}+\frac{4}{54}\\\\=\frac{19}{54}\\[/tex]
Therefore, the probability of winning the game before the fourth turn is [tex]\frac{19}{54}[/tex].
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find C on the directed line segment AB with A(-2, 6) and B(8,1) such that AC:CB = 2:3
To find the point C on the directed line segment AB such that the ratio of AC to CB is 2:3, we can use the concept of the section formula. By applying the section formula, we can calculate the coordinates of point C.
The section formula states that if we have two points A(x1, y1) and B(x2, y2), and we want to find a point C on the line segment AB such that the ratio of AC to CB is given by m:n, then the coordinates of point C can be calculated as follows:
Cx = (mx2 + nx1) / (m + n)
Cy = (my2 + ny1) / (m + n)
Using the given points A(-2, 6) and B(8, 1), and the ratio AC:CB = 2:3, we can substitute these values into the section formula to calculate the coordinates of point C. By substituting the values into the formula, we obtain the coordinates of point C.
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Please answer all 3 questions, thank youuu.
2 Points Question 4 A spring has a natural length of 15 inches. A force of 10 lbs. is required to keep it stretched 5 inches beyond its natural length. Find the work done in stretching it from 20 inch
The work done in stretching the spring from 20 inches is 50 inches• lbs.
Given, A spring has a natural length of 15 inches. A force of 10 lbs. is required to keep it stretched 5 inches beyond its natural length. We have to find the work done in stretching it from 20 inches.
Here, The work done in stretching a spring can be determined by the formula, W = 1/2 kx² Where, W represents work done in stretching a spring k represents spring constant x represents distance stretched beyond natural length
Therefore, we have to first find the spring constant, k. Given force, F = 10 lbs, distance, x = 5 inches. Then k = F / x = 10 / 5 = 2The spring constant of the spring is 2.
Therefore, Work done to stretch the spring by 5 inches beyond its natural length will be, W = 1/2 kx² W = 1/2 x 2 x 5² = 25 inches •lbs
Work done = work done to stretch the spring by 5 inches beyond its natural length + work done to stretch the spring by additional 15 inches W = 25 + 1/2 x 2 x (20 - 15)²
W = 25 + 1/2 x 2 x 5²
W = 25 + 25W = 50 inches •lbs
Hence, the work done in stretching the spring from 20 inches is 50 inches• lbs.
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Given the system function (s + a) H(s) = (s +ß) (As² + Bs + C) • Find or reverse engineer a RCL circuit that has a system function that has this form. Keep every R, C, and L symbolic. Answer the following questions on paper: • Draw the system and derive the differential equations. Find the system function. What did you define as input and output to the system?
In terms of input and output, we can define V_in as the input voltage and V_out as the output voltage across the capacitor. This corresponds to a voltage divider circuit with the capacitor as the lower leg and the resistor as the upper leg. The circuit acts as a low-pass filter that attenuates high-frequency signals and passes low-frequency signals.
To reverse engineer a RCL circuit that has the given system function, we can start by expanding the equation to get:
H(s) = (s + ß)(As^2 + Bs + C)/(s + a)
We can then factorize the denominator to get:
H(s) = (s + ß)(As^2 + Bs + C)/(s + a)(1)
We can recognize the denominator (s + a) as the transfer function of a simple first-order low-pass filter with a time constant of 1/a. To create the numerator (As^2 + Bs + C), we can use a second-order circuit with a similar transfer function. Specifically, we can use a series RLC circuit with a capacitor and inductor in parallel with a resistor.
The circuit diagram would look like this:
V_in ----(R)----(L)-----+-----[C]----- V_out
|
|
-----
---
-
where R, L, and C are the values we need to solve for symbolically.
To derive the differential equations, we can use Kirchhoff's voltage and current laws. Assuming that the voltage across the capacitor is V_C and the current through the inductor is I_L, we can write:
V_in - V_C - IR = 0 (Kirchhoff's voltage law for the loop)
V_C = L dI_L/dt (definition of inductor voltage)
I_L = C dV_C/dt (definition of capacitor current)
Substituting the second and third equations into the first equation and simplifying, we get:
L d^2V_C/dt^2 + R dV_C/dt + 1/C V_C = V_i
This is the differential equation for the circuit.To find the system function, we can take the Laplace transform of the differential equation and solve for V_out/V_in:
V_out/V_in = H(s) = 1/(s^2 LC + sRC + 1
Comparing this expression with the system function given in the question, we can identify:
ß = 0
A = C
B = R
a = 1
ß and a correspond to the poles of the transfer function, while A, B, and C correspond to the coefficients of the numerator polynomial.
In terms of input and output, we can define V_in as the input voltage and V_out as the output voltage across the capacitor. This corresponds to a voltage divider circuit with the capacitor as the lower leg and the resistor as the upper leg. The circuit acts as a low-pass filter that attenuates high-frequency signals and passes low-frequency signals.
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4. In certain parts of the African continent, HIV infection occurs in many cases with a tuberculosis (TB) infection. Assume that 40% of people have TB, 20% of people have HIV, and 15% have both. What is the probability that a person has HIV or TB? 5. A tombola contains 5 red balls and 5 black balls. If 3 balls are chosen at random, what is the probability that all three balls are red? 6. Suppose the prevalence of COVID is 12.5%. We assume that the diagnostic test has a sensitivity of 80% and a specificity of 95%. What is the probability of getting a negative result? 7. Assume the prevalence of breast cancer is 13%. The diagnostic test has a sensitivity of 86.9% and a specificity of 88.9%. If a patient tests positive, what is the probability that the patient has breast cancer?
The probability that a person has HIV or TB is 0.45. The probability of choosing all three red balls is 0.0833. The probability of getting a negative result for COVID is approximately 97.4%.
Understanding Probability Scenarios4. To find the probability that a person has HIV or TB, we can use the principle of inclusion-exclusion. The formula is:
P(HIV or TB) = P(HIV) + P(TB) - P(HIV and TB)
Given:
P(TB) = 0.40
P(HIV) = 0.20
P(HIV and TB) = 0.15
Using the formula, we have:
P(HIV or TB) = 0.20 + 0.40 - 0.15 = 0.45
Therefore, the probability that a person has HIV or TB is 0.45 or 45%.
5. The probability of choosing all three red balls can be calculated as:
P(3 red balls) = (number of ways to choose 3 red balls) / (total number of ways to choose 3 balls)
The number of ways to choose 3 red balls from 5 is given by the combination formula:
C(5, 3) = 5! / (3!(5-3)!) = 5! / (3!2!) = (5 * 4) / (2 * 1) = 10
The total number of ways to choose 3 balls from 10 (5 red and 5 black) is given by:
C(10, 3) = 10! / (3!(10-3)!) = 10! / (3!7!) = (10 * 9 * 8) / (3 * 2 * 1) = 120
Therefore, the probability of choosing all three red balls is:
P(3 red balls) = 10 / 120 = 1 / 12 ≈ 0.0833 or 8.33%.
6. To find the probability of getting a negative result for COVID, we need to consider the sensitivity and specificity of the diagnostic test.
The sensitivity of the test is the probability of testing positive given that the person has COVID. In this case, the sensitivity is 80%, which can be written as:
P(Positive | COVID) = 0.80
The specificity of the test is the probability of testing negative given that the person does not have COVID. In this case, the specificity is 95%, which can be written as:
P(Negative | No COVID) = 0.95
We also know the prevalence of COVID, which is 12.5%, or:
P(COVID) = 0.125
Using Bayes' theorem, we can calculate the probability of getting a negative result:
P(No COVID | Negative) = [P(Negative | No COVID) * P(No COVID)] / [P(Negative | No COVID) * P(No COVID) + P(Negative | COVID) * P(COVID)]
Plugging in the values:
P(No COVID | Negative) = [0.95 * (1 - 0.125)] / [0.95 * (1 - 0.125) + 0.20 * 0.125]
Simplifying:
P(No COVID | Negative) = 0.935 / (0.935 + 0.025) ≈ 0.974 or 97.4%
Therefore, the probability of getting a negative result for COVID is approximately 97.4%.
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Use the binomial theorem to find the coefficient of x18y2 in the expansion of (2x3 – 4y2);
The coefficient of x¹⁸y² in the expansion of (2x³ – 4y²)²⁰ is 1.
to find the coefficient of x¹⁸y² in the expansion of (2x³ – 4y²)²⁰, we can use the binomial theorem.
the binomial theorem states that for any positive integer n, the expansion of (a + b)ⁿ can be written as the sum of the terms of the form c(n, r) * a⁽ⁿ⁻ʳ⁾ * bʳ, where c(n, r) represents the binomial coefficient.
in this case, we have (2x³ – 4y²)²⁰. to find the coefficient of x¹⁸y², we need to find the term where the exponents of x and y satisfy the equation 3(n-r) + 2r = 18 and 2(n-r) + r = 2.
from the first equation, we get:3n - 3r + 2r = 18
3n - r = 18
from the second equation, we get:
2n - 2r + r = 2
2n - r = 2
solving these equations simultaneously, we find that n = 6 and r = 6.
using the binomial coefficient formula c(n, r) = n! / (r!(n-r)!), we can calculate the coefficient:
c(6, 6) = 6! / (6!(6-6)!) = 1
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a body moves on a coordinate line such that it has a position s=f(t)=t^2-8t+7 on the interval 0(greater than or equal to)t(greater than or equal to)9 with s in meters and t in seconds
a)find the bodys displacement and average velocity for the given time interval
b)find the bodys speed and acceleration at the endpoints of the interval
c)when,if ever,during the interval does the body change direction?
a. The bodys displacement and average velocity for the given time interval are 16 meters and 1.778 meters/second respectively
b. The bodys speed is 10 meters/second and velocity 10 meters/second
c. The body changes direction at t = 4 seconds.
a) To find the body's displacement on the given time interval, we need to calculate the change in position (s) from t = 0 to t = 9:
Displacement = f(9) - f(0)
Substituting the values into the position function, we get:
Displacement = (9^2 - 89 + 7) - (0^2 - 80 + 7)
= (81 - 72 + 7) - (0 - 0 + 7)
= 16 meters
The body's displacement on the interval [0, 9] is 16 meters.
To find the average velocity, we divide the displacement by the time interval:
Average Velocity = Displacement / Time Interval
= 16 meters / 9 seconds
≈ 1.778 meters/second
b) To find the body's speed at the endpoints of the interval, we need to calculate the magnitude of the velocity at t = 0 and t = 9.
At t = 0:
Velocity at t = 0 = f'(0)
Differentiating the position function, we get:
f'(t) = 2t - 8
Velocity at t = 0 = f'(0) = 2(0) - 8 = -8 meters/second
At t = 9:
Velocity at t = 9 = f'(9)
Velocity at t = 9 = 2(9) - 8 = 10 meters/second
The body's speed at the endpoints of the interval is the magnitude of the velocity:
Speed at t = 0 = |-8| = 8 meters/second
Speed at t = 9 = |10| = 10 meters/second
c) The body changes direction whenever the velocity changes sign. In this case, the velocity function is 2t - 8. The velocity changes sign when:
2t - 8 = 0
2t = 8
t = 4
Therefore, the body changes direction at t = 4 seconds.
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In each of problems 1 through 4: (a) Show that the given differential equation has a regular singular point at x = 0). 0. (b) Determine the indicial equation, the recurrence relation, and the roots of the indicial equation. (c) Find the series solution (> 0) corresponding to the larger root. (d) If the roots are unequal and do not differ by an integer, find the series solution corresponding to the smaller root also. 1. 3xy" + 2xy' + x²y = 0 2. xy + y - y = 0 3. xy'' + (1 - 2)y' – y = 0 4. 2x2 y'' + 3xy' + (2x2 – 1)y = 0 =
a. The coefficients 3x, 2x, and x² are all analytic at x = 0.
b. The roots of the indicial equation are r = 0 and r = 1/3.
c. The series solution corresponding to the larger root r = 1/3 is given by:
y = [tex]a_0 x^{(1/3)} + a_1 x^{(4/3)[/tex] + ∑(n=2 to ∞) [tex]a_n x^{(n+1/3)[/tex]
d. There is no series solution corresponding to the smaller root for this case.
What is differentiation?A derivative of a function with respect to an independent variable is what is referred to as differentiation. Calculus's concept of differentiation can be used to calculate the function per unit change in the independent variable.
1. Differential equation: 3xy" + 2xy' + x²y = 0
(a) To show that the given differential equation has a regular singular point at x = 0, we need to check if all the coefficients of the terms involving y, y', and y" are analytic at x = 0.
In this case, the coefficients 3x, 2x, and x² are all analytic at x = 0.
(b) Indicial equation:
The indicial equation is obtained by substituting [tex]y = x^r[/tex] into the differential equation and equating the coefficient of the lowest-order derivative term to zero.
Substituting y = [tex]x^r[/tex] into the given equation, we have:
[tex]3x(x^r)" + 2x(x^r)' + x^2(x^r) = 0[/tex]
[tex]3x(r(r-1)x^{(r-2)}) + 2x(rx^{(r-1)}) + x^2(x^r) = 0[/tex]
[tex]3r(r-1)x^r + 2rx^r + x^{(r+2)[/tex] = 0
The coefficient of [tex]x^r[/tex] term is 3r(r-1) + 2r = 0.
Simplifying the equation, we get:
3r² - 3r + 2r = 0
3r² - r = 0
r(3r - 1) = 0
The roots of the indicial equation are r = 0 and r = 1/3.
(c) Series solution corresponding to the larger root (r = 1/3):
Assuming a series solution of the form y = ∑(n=0 to ∞) [tex]a_n x^{(n+r)[/tex], where a_n are constants, we substitute this into the differential equation.
Plugging in the series solution into the differential equation, we have:
3x((∑(n=0 to ∞) [tex]a_n x^[(n+r)})[/tex]") + 2x((∑(n=0 to ∞) a_n x^(n+r))') + x²(∑(n=0 to ∞) [tex]a_n x^{(n+r)})[/tex] = 0
Differentiating and simplifying the terms, we obtain:
3x(∑(n=0 to ∞) (n+r)(n+r-1)a_n x^(n+r-2)) + 2x(∑(n=0 to ∞) (n+r)[tex]a_n x^{(n+r-1)})[/tex] + x²(∑(n=0 to ∞) [tex]a_n x^{(n+r))[/tex] = 0
Now we combine the series terms and equate the coefficients of like powers of x to zero.
For the coefficient of [tex]x^n[/tex]:
3(n+r)(n+r-1)a_n + 2(n+r)a_n + a_n = 0
3(n+r)(n+r-1) + 2(n+r) + 1 = 0
(3n² + 5n + 2)r + 3n² + 2n + 1 = 0
Since this equation should hold for all n, the coefficient of r and the constant term should be zero.
3n² + 5n + 2 = 0
(3n + 2)(n + 1) = 0
The roots of this equation are n = -1 and n = -2/3.
So, the recurrence relation becomes:
a_(n+2) = -[(3n² + 2n + 1)/(3(n+2)(n+1))] * [tex]a_n[/tex]
The series solution corresponding to the larger root r = 1/3 is given by:
y = [tex]a_0 x^{(1/3)} + a_1 x^{(4/3)[/tex] + ∑(n=2 to ∞) [tex]a_n x^{(n+1/3)[/tex]
(d) Series solution corresponding to the smaller root (r = 0):
Assuming a series solution of the form y = ∑(n=0 to ∞) [tex]a_n x^{(n+r)}[/tex], where [tex]a_n[/tex] are constants, we substitute this into the differential equation.
Plugging in the series solution into the differential equation, we have:
3x((∑(n=0 to ∞) [tex]a_n x^{(n+r)})[/tex]") + 2x((∑(n=0 to ∞) [tex]a_n x^{(n+r)})[/tex]') + x²(∑(n=0 to ∞) [tex]a_n x^{(n+r)})[/tex] = 0
Differentiating and simplifying the terms, we obtain:
3x(∑(n=0 to ∞) (n+r)(n+r-1)[tex]a_n x^{(n+r-2)})[/tex] + 2x(∑(n=0 to ∞) (n+r)[tex]a_n x^{(n+r-1)})[/tex] + x²(∑(n=0 to ∞) [tex]a_n x^{(n+r)}) = 0[/tex]
Now we combine the series terms and equate the coefficients of like powers of x to zero.
For the coefficient of [tex]x^n[/tex]:
[tex]3(n+r)(n+r-1)a_n + 2(n+r)a_n + a_n = 0[/tex]
[tex]3n(n-1)a_n + 2na_n + a_n = 0[/tex]
(3n² + 2n + 1)[tex]a_n[/tex] = 0
Since this equation should hold for all n, the coefficient of [tex]a_n[/tex] should be zero.
3n² + 2n + 1 = 0
The roots of this equation are not real and differ by an integer. Therefore, there is no series solution corresponding to the smaller root for this case.
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Sketch and label triangle ABC where A = 20°, B = 80°, c = 13 cm. Solve the triangle to find all missing measurements, rounding all results to the nearest whole number.
After solving the triangle we have the measurements as angles A = 20°, B = 80°, C = 80° and length of the sides as a ≈ 5 cm, b ≈ 13 cm, c = 13 cm
.
To sketch and solve triangle ABC, where A = 20°, B = 80°, and c = 13 cm, we start by drawing a triangle and labeling the given angle and side.
Sketching the Triangle:
Start by drawing a triangle. Label one of the angles as A (20°), another angle as B (80°), and the side opposite angle B as c (13 cm). Ensure the triangle is drawn to scale.
Solving the Triangle:
To find the missing measurements, we can use the Law of Sines and the fact that the sum of angles in a triangle is 180°.
a) Finding angle C:
Since the sum of angles in a triangle is 180°, we can find angle C:
C = 180° - A - B
C = 180° - 20° - 80°
C = 80°
b) Finding side a:
Using the Law of Sines:
a / sin(A) = c / sin(C)
a / sin(20°) = 13 / sin(80°)
a ≈ 5 cm (rounded to the nearest whole number)
c) Finding side b:
Using the Law of Sines:
b / sin(B) = c / sin(C)
b / sin(80°) = 13 / sin(80°)
b ≈ 13 cm (rounded to the nearest whole number)
Now we have the measurements of the triangle:
A = 20°, B = 80°, C = 80°
a ≈ 5 cm, b ≈ 13 cm, c = 13 cm
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7. Write the given system in matrix form: x = (2t)x + 3y y' = e'x + (cos(t))y
The matrix form of the given system as:
[x'] = [ (2t) 3 ] * [x]
[y'] [ e cos(t) ] [y]
The given system is:
x' = (2t)x + 3y
y' = ex + (cos(t))y
To write this system in matrix form, we need to express it as a product of matrices. The general form for a first-order linear system of equations in matrix form is:
[X'] = [A(t)] * [X]
where [X'] and [X] are column vectors representing the derivatives and variables, and [A(t)] is the coefficient matrix. In this case, we have:
[X'] = [x', y']^T
[X] = [x, y]^T
Now, we need to find the matrix [A(t)]. To do this, we write the coefficients of x and y in the given system as the elements of the matrix:
[A(t)] = [ (2t) 3 ]
[ e cos(t) ]
Now we can write the matrix form of the given system as:
[x'] = [ (2t) 3 ] * [x]
[y'] [ e cos(t) ] [y]
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plot the points a=(−1,1), b=(1,2), and c=(−3,5). notice that these points are vertices of a right triangle (the angle a is 90 degrees).
The points A(-1,1), B(1,2), and C(-3,5) form the vertices of a right triangle, with angle A being 90 degrees. By plotting these points on a coordinate plane, we can visually observe the right triangle formed.
To plot the points A(-1,1), B(1,2), and C(-3,5), we can use a coordinate plane. The x-coordinate represents the horizontal position, while the y-coordinate represents the vertical position.
Plotting the points, we place A at (-1,1), B at (1,2), and C at (-3,5). By connecting these points, we can observe that the line segment connecting A and B is the base of the triangle, and the line segment connecting A and C is the height.
To verify that angle A is 90 degrees, we can calculate the slopes of the two line segments. The slope of the line segment AB is (2-1)/(1-(-1)) = 1/2, and the slope of the line segment AC is (5-1)/(-3-(-1)) = 2. Since the slopes are negative reciprocals of each other, the two line segments are perpendicular, confirming that angle A is a right angle.
By visually examining the plotted points, we can confirm that A(-1,1), B(1,2), and C(-3,5) form the vertices of a right triangle with angle A being 90 degrees.
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Evaluate the integral by making the given substitution. (Use C for the constant of integration.) COS / (vi) dt, u= vt Vi
When we evaluate the integral ∫cos(vt) dt using the given substitution u = vt, we need to express dt in terms of du, the evaluated integral is (1/v) sin(vt) + C.
Differentiating both sides of the substitution equation u = vt with respect to t gives du = v dt. Solving for dt, we have dt = du / v.
Now we can substitute dt in terms of du / v in the integral:
∫cos(vt) dt = ∫cos(u) (du / v)
Since v is a constant, we can take it out of the integral:
(1/v) ∫cos(u) du
Integrating cos(u) with respect to u, we get:
(1/v) sin(u) + C
Finally, substituting back u = vt, we have:
(1/v) sin(vt) + C
Therefore, the evaluated integral is (1/v) sin(vt) + C.
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bem bpight a box pf ;aundry detergent that contains 195 scoops. each load pf laundry use 1/2 2 scoops. how many loads of laundry can ben do with one box of laundry detergent
Therefore, Ben can do 390 loads of laundry with one box of laundry detergent.
Ben bought a box of laundry detergent that contains 195 scoops. Each load of laundry uses 1/2 scoop.
To determine how many loads of laundry Ben can do with one box of detergent, we divide the total number of scoops by the scoops used per load:
Number of loads = Total scoops / Scoops per load
Number of loads = 195 scoops / (1/2 scoop per load)
Number of loads = 195 scoops * (2/1) = 390 loads
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please do these 3 multiple
choice questions, no work or explanation is required just answers
are pwrfect fine, will leave a like for sure!
Question 17 (1 point) How many solutions are there to the system of equations 2x+9y-31 and -10x+6y=-2? infinity 3 01 0
Question 18 (1 point) Determine the value of k for which there is an infinite nu
Question 17: 1 solution; Question 18: k = 5; Question 19: Infinite solutions
Question 17: How many solutions are there to the system of equations 2x+9y=31 and -10x+6y=-2?
To determine the number of solutions, we can use various methods such as graphing, substitution, or elimination. In this case, we can use the method of elimination by multiplying the first equation by 10 and the second equation by 2 to eliminate the x terms. This gives us 20x + 90y = 310 and -20x + 12y = -4.
By adding the two equations together, we get 102y = 306, which simplifies to y = 3. Substituting this value of y back into either of the original equations, we find that x = 2.
Therefore, the system of equations has a unique solution, which means there is 1 solution.
Question 18: Determine the value of k for which there is an infinite number of solutions.
To determine the value of k, we need to look at the system of equations and analyze its coefficients. However, since the second equation is not provided, it is not possible to determine the value of k or whether there are infinite solutions. Additional information or equations are needed to solve this problem.
Question 19: How many solutions are there to the system of equations -3x + 4y = 12 and 9x - 12y = -36?
To determine the number of solutions, we can use the method of elimination. By multiplying the first equation by 3 and the second equation by -1, we can eliminate the x terms. This gives us -9x + 12y = -36 and -9x + 12y = 36.
Subtracting the two equations, we get 0 = 0. This means the two equations are dependent and represent the same line. Therefore, there are infinite solutions to this system of equations.
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Given Equilateral Triangle ABC with Medians AD, BE and
CF below. If DO=3cm and DC-5.2cm, what is the area of
Triangle ABC?
A
The formula for the Area of a triangle is: 1
Area of the triangle =
B
cm²
120
R.
E
= (bh)
=
P
The area of equilateral triangle ABC is equal to 46.8 cm².
How to calculate the area of a triangle?In Mathematics and Geometry, the area of a triangle can be calculated by using the following mathematical equation (formula):
Area of triangle = 1/2 × b × h
Where:
b represent the base area.h represent the height.Based on the information provided in the image (see attachment), we can logically deduce that point D is the midpoint of line segment BC;
BC = 2DC
BC = 2 × 5.4 = 10.4 cm.
Since point O is the center of triangle ABC, we have:
AO = 2DO
AO = 2 × 3 = 6 cm.
Therefore, line segment AD is given by;
AD = AO + DO
AD = 6 + 3
AD = 9 cm.
Now, we can determine the area of triangle ABC as follows:
Area of triangle ABC = 1/2 × BC × AD
Area of triangle ABC = 1/2 × 10.4 × 9
Area of triangle ABC = 46.8 cm².
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Missing information:
The question is incomplete and the complete question is shown in the attached picture.
PLEASE HELP WILL REWARD BRAINLIEST!
the first three terms in the binomial expansion of (1+3x)^n are 1+kx-x^2, where n and k are constants. n>1/2.
a) work out the value of n and the value of k
Answer:
Value of n:
Since the first three terms in the binomial expansion are 1 + kx - x^2, we can compare this with the general binomial expansion formula:
(1 + bx)^n = 1 + n(bx) + (n(n-1)/2)(bx)^2 + ...
Comparing the terms, we see that n(bx) = kx, which means n = k.
Value of k:
From the given expression, we have 1 + kx - x^2. Since the coefficient of x is k, we can conclude that k = 1.
Therefore, the value of n is 1 and the value of k is 1.
Step-by-step explanation:
hope this helps :)
Consider the following. у 6 y= x - 2x 41 N -4 х -2 N N y = 2x -4 - 6 (a) Find the points of intersection of the curves. (xy (smallest x-value) (x, y) = (1 (x, y) = ( =( Y) (x, y) = (largest y-value)
The curves given by the equations intersect at two points, namely (1, -2) and (5, -4). The point with the smallest x-value of intersection is (1, -2), while the point with the largest y-value of intersection is (5, -4).
To find the points of intersection, we need to set the two equations equal to each other and solve for x and y. The given equations are y = x - 2x^2 + 41 and y = 2x - 4. Setting these equations equal to each other, we have x - 2x^2 + 41 = 2x - 4.
Simplifying this equation, we get 2x^2 - 3x + 45 = 0. Solving this quadratic equation, we find two values of x, which are x = 1 and x = 5. Substituting these values back into either equation, we can find the corresponding y-values.
For x = 1, y = 1 - 2(1)^2 + 41 = -2, giving us the point (1, -2). For x = 5, y = 2(5) - 4 = 6, giving us the point (5, 6). Therefore, the points of intersection of the curves are (1, -2) and (5, 6). Among these points, (1, -2) has the smallest x-value, while (5, 6) has the largest y-value.
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PLEASE ANSWER A,B,C, or D
Which graph shows the solution to the system of linear equations?
y equals negative one third times x plus 1
y = −2x − 3
a coordinate grid with one line that passes through the points 0 comma 1 and 4 comma 0 and another line that passes through the points 0 comma negative 1 and 1 comma negative 3
a coordinate grid with one line that passes through the points 0 comma 1 and 3 comma 0 and another line that passes through the points 0 comma negative 3 and 1 comma negative 5
a coordinate grid with one line that passes through the points 0 comma 1 and 3 comma negative 1 and another line that passes through the points 0 comma negative 1 and 2 comma negative 5
a coordinate grid with one line that passes through the points 0 comma 1 and 4 comma negative 2 and another line that passes through the points 0 comma negative 2 and 1 comma negative 5
A coordinate grid with one line that passes through the points 0,1 and 4,0 and another line that passes through the points 0,-1 and 1,-3.
The system of linear equations given is:
y = (-1/3)x + 1
y = -2x - 3
We can determine the solution to this system by finding the point of intersection of the two lines represented by these equations.
By comparing the coefficients of x and y in the equations, we can see that the slopes of the lines are different.
The slope of the first line is -1/3, and the slope of the second line is -2. Since the slopes are different, the lines will intersect at a single point.
To find the point of intersection, we can set the two equations equal to each other:
(-1/3)x + 1 = -2x - 3
By solving this equation, we find that x = 3.
Substituting this value back into either equation, we can find the corresponding y-value.
Using the first equation, when x = 3, y = (-1/3)(3) + 1 = 0.
Therefore, the point of intersection is (3,0), which lies on both lines.
The graph that shows the solution to the system of linear equations is the one with a coordinate grid where one line passes through the points (0,1) and (4,0), and another line passes through the points (0,-1) and (1,-3). This graph represents the intersection point (3,0) of the two lines, which is the solution to the system of equations.
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