Answer:0.98
2.17 are correct
Step-by-step explanation:
-u^2 - 4u + 4 = 0
Multiplying both sides by -1, we get:
u^2 + 4u - 4 = 0
Now we can use the quadratic formula to solve for u:
u = (-b ± sqrt(b^2 - 4ac)) / 2a
where a = 1, b = 4, and c = -4. Substituting these values, we get:
u = (-4 ± sqrt(4^2 - 4(1)(-4))) / 2(1)
u = (-4 ± sqrt(32)) / 2
u = (-4 ± 4sqrt(2)) / 2
u = -2 ± 2sqrt(2)
Therefore, either:
Please help with this question I’m stuck brainiest and points will be rewarded
Matching of the statements with their respective linear equations are:
1) The line contains (0, -8) and a slope of 3/2: y = ³/₂x - 8
2) A line that contains the point (0, -2) and (4, 0): 2y - x = -4
3) y-intercept is (0, -2) and slope is -3/4: y = -³/₄x - 2
4) A line that has a slope of 5/3 and a y-intercept of -4: 5x + 3y = -12
How to Identify the linear equation?The formula for the equation of a line in slope intercept form is:
y = mx + c
where:
m is slope
c is y-intercept
1) The line contains (0, -8) and a slope of 3/2
The only option that even has a slope of 3/2 is option B with the equation: y = ³/₂x - 8
2) A line that contains the point (0, -2) and (4, 0)
The only one that fits this is option C with the equation:
2y - x = -4
3) y-intercept is (0, -2) and slope is -3/4.
This means the only equation that matches it is:
y = -³/₄x - 2
4) A line that has a slope of 5/3 and a y-intercept of -4.
This means the only equation that matches it is:
5x + 3y = -12
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Assume that the speed of automobiles on an expressway during rush hour is normally distributed with mean of 62 mph and a standard deviation of 5 mph.
What percent of cars are traveling slower than 62 mph?
Write your percentage as a decimal (so 12% = 0.12)!
The percentage of cars traveling slower than 62 mph during rush hour is 0.5 or 50%.
Since the speed of automobiles on an expressway during rush hour is normally distributed with a mean of 62 mph and a standard deviation of 5 mph, we can use the cumulative distribution function (CDF) of the normal distribution to find the percentage of cars traveling slower than 62 mph.
Let X be the speed of an automobile on the expressway during rush hour. Then, X follows a normal distribution with mean (µ) = 62 mph and standard deviation (σ) = 5 mph.
We want to find P(X < 62), which represents the probability that a car is traveling slower than 62 mph.
Using the standard normal distribution table or a calculator with built-in functions for the normal distribution, we can find the z-score corresponding to the value X = 62, using the formula;
z = (X - µ) / σ
Plugging in the given values;
z = (62 - 62) / 5 = 0
Now, we can find the cumulative distribution function (CDF) of the standard normal distribution at z = 0, denoted as Φ(0), which represents the probability that a standard normal random variable is less than or equal to 0.
Using the standard normal distribution table or a calculator with built-in functions for the normal distribution, we can find Φ(0) to be approximately 0.5.
So, P(X < 62) = Φ(0)
= 0.5
Therefore, the percentage of car is 0.5 or 50%
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Find the equation of a line that passes through the point ( 4 , 2 ) that is perpendicular to the line y = 4 3 x . Show your work.
The equation of the line that passes through the point (4, 2) and is perpendicular to the line y = 43x is y = (-1/43)x + (90/43).
What is the equation of a line that passes through the point ( 4 , 2 ) that is perpendicular to the line y = 43x?The formula for equation of line is expressed as;
y = mx + b
Where m is slope and b is y-intercept.
Given that the line has a slope of 43.
To find the slope of the line perpendicular to it, we use the fact that the product of the slopes of two perpendicular lines is -1.
So, the slope of the perpendicular line is -1/43.
Using the point-slope form of a line, we can write the equation of the line as:
y - y1 = m(x - x1),
where (x1, y1) = (4, 2) and m = -1/43
Plugging in the values, we get:
y - 2 = (-1/43)(x - 4)
y - 2 = (-1/43)x + (4/43)
y = (-1/43)x + (4/43) + 2
y = (-1/43)x + (90/43)
Therefore, the equation of the line is y = (-1/43)x + (90/43).
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Please help!!!!! I am in need of it, this is for math nation unit 1 and im failing!!!!!!!
Answer:
5
Step-by-step explanation:
use the table, when it asks f(2) that says what is the output *y) when the input is 2. Find when x=2 your answer is the y value, f(2)=5
The vertices of a quadrilateral are listed below.
The strongest classification of the quadrilateral with the given vertices is rhombus.
The vertices of the quadrilateral is given as,
E(5, 4), F(9, 2), G(5, 0) and H(1, 2).
Find the adjacent sides EF and FG whether they are equal.
Using the distance formula,
EF = √(9 - 5)² + (2 - 4)² = √(16 + 4) = √20
FG = √(5 - 9)² + (0 - 2)² = √(16 + 4) = √20
Adjacent sides are equal.
So they are either square or rhombus.
Find the lengths of the diagonals whether they are equal.
EG = √(5 - 5)² + (0 - 4)² = √(0 + 16) = 4
FH = √(1 - 9)² + (2 - 2)² = √(64 + 0) = 8
Diagonals are not equal.
So it is a rhombus.
Hence the quadrilateral is a rhombus.
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opic: Choosing ping-pong balls without replacement.
There are 6 white and 3 orange ping-pong balls in a brown paper bag. Two balls are randomly chosen.
Enter your answers as fractions. They do not need to be reduced.
(The "Preview" simply displays your answer in nice mathematical text.
It does not mean that your answer is either right or wrong.)
a) How many total balls are in the bag at the start?
b) What is the probability that the 1st ball is orange?
P(1st = orange) =
c) What is the probability that the 2nd ball is also orange, given that the 1st ball was orange?
P(2nd = orange | 1st = orange) =
d) What is the probability that both the 1st and the 2nd balls are orange
a) The total number of balls in a bag is 9.
b) The probability that the first ball chosen is orange is 1/3.
c) The probability that the 2nd ball is also orange is 1/4.
d) The probability that both balls are orange is 1/12.
Given that:
Balls, White = 6 and Orange = 3
a) The total of ping-pong balls in the bag at the start is calculated as,
Total ball = 6 + 3
Total ball = 9
b) The probability that the first ball chosen is orange is calculated as,
P(Orange) = 3/9
P(Orange) = 1/3
c) There will be 8 balls in the bag, of which 2 are orange if the first ball selected was an orange ball. Then the probability is calculated as,
P(Orange) = 2/8
P(Orange) = 1/4
d) The product rule of probability may be used to determine the likelihood that the first and second balls are both orange:
P(Orange and Orange) = 1/3 x 1/4
P(Orange and Orange) = 1/12
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Consider the parabola given by the equation:
f
(
x
)
=
−
2
x
2
−
8
x
+
14
Find the following for this parabola:
A) The value of
f
(
−
5
)
:
B) The vertex = (
,
)
C) The
y
intercept is the point (0,
)
D) Find the two values of
x
that make
f
(
x
)
=
0
. Round your answers to two decimal places. Write the values as a list, separated by commas:
x
=
Answer:
Sure, here are the answers to your questions:
**A) The value of $f(-5)$ is $-2$.**
To find the value of $f(-5)$, we can simply substitute $x=-5$ into the equation $f(x)=-2x^2-8x+14$. This gives us:
$$f(-5)=-2(-5)^2-8(-5)+14=-2(25)+40+14=-50+54=4$$
**B) The vertex of the parabola is $(2,6)$.**
To find the vertex of the parabola, we can complete the square. This involves adding and subtracting $\left(\dfrac{{b}}{2}\right)^2$ to both sides of the equation, where $b$ is the coefficient of the $x$ term. In this case, $b=-8$, so we have:
$$\begin{aligned}f(x)&=-2x^2-8x+14\\\\ f(x)+20&=-2x^2-8x+14+20\\\\ f(x)+20&=-2(x^2+4x)\\\\ f(x)+20&=-2(x^2+4x+4)\\\\ f(x)+20&=-2(x+2)^2\end{aligned}$$
Now, if we subtract 20 from both sides, we get the equation of the parabola in vertex form:
$$f(x)=-2(x+2)^2-20$$
The vertex of a parabola in vertex form is always the point $(h,k)$, where $h$ is the coefficient of the $x$ term and $k$ is the constant term. In this case, $h=-2$ and $k=-20$, so the vertex of the parabola is $(-2,-20)$. We can also see this by graphing the parabola.
[Image of a parabola with vertex at (-2, -20)]
**C) The $y$-intercept is the point $(0,14)$.**
The $y$-intercept of a parabola is the point where the parabola crosses the $y$-axis. This happens when $x=0$, so we can simply substitute $x=0$ into the equation $f(x)=-2x^2-8x+14$ to find the $y$-intercept:
$$f(0)=-2(0)^2-8(0)+14=14$$
Therefore, the $y$-intercept is the point $(0,14)$.
**D) The two values of $x$ that make $f(x)=0$ are $2.5$ and $-3.5$.**
To find the values of $x$ that make $f(x)=0$, we can set the equation $f(x)=-2x^2-8x+14$ equal to zero and solve for $x$. This gives us:
$$-2x^2-8x+14=0$$
We can factor the left-hand side of the equation as follows:
$$-2(x-2)(x-3)=0$$
This means that either $x-2=0$ or $x-3=0$. Solving for $x$ in each case gives us the following values:
$$x=2\text{ or }x=3$$
However, we need to round our answers to two decimal places. To do this, we can use the calculator. Rounding $x=2$ and $x=3$ to two decimal places gives us the following values:
$$x=2.5\text{ and }x=-3.5$$
Therefore, the two values of $x$ that make $f(x)=0$ are $2.5$ and $-3.5$.
6. Teachers' Salaries New York and Massachusetts lead the list of average teacher's
salaries. The New York average is $76,409 while teachers in Massachusetts make an
average annual salary of $73,195. Random samples of 45 teachers from each state
yielded the following.
Step-by-step explanation:
Andrew deposits $40 in a saving account earning5% interest, compounded annually. Which function can be used to determine the amount of money in the savings account after x years
The function that can be used to determine the amount of money is f(x) = 40 * (1.05)^x
Which function can be used to determine the amount of moneyFrom the question, we have the following parameters that can be used in our computation:
Principal = 40
Rate = 5% annually
Time = x
The function that can be used to determine the amount of money is represented as
f(x) = P * (1 + r)^x
Substitute the known values in the above equation, so, we have the following representation
f(x) = 40 * (1 + 5%)^x
Evaluate
f(x) = 40 * (1.05)^x
Hence, the function is f(x) = 40 * (1.05)^x
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Select the correct answer.
What is √81y6 in simplest form?
A. 3√/9y
B. 9y^4
C.3 √9y^2
D.9y^3
The answer…………………..:
Answer:
what?
Step-by-step explanation:
Round to the nearest whole number, then find the sum. 15.43 + 12.85 + 21.3 = ___ pls i will give 60 points!!!!!!!!!!
Answer:
15.43 + 12.85 + 21.3 = 49.58
Rounding to the nearest whole number, the sum is 50.
Step-by-step explanation:
Answer:
15.43 + 12.85 + 21.3 = 49.58
Step-by-step explanation:
The table shows the distribution, by age and gender, of the million people in a certain region who live alone. Use the data in the table to find the probability that a randomly selected person in the region is a woman in the 1824 age range living alone.
The probability that a randomly selected person in the region is a woman in the 18-24 age range living alone is approximately 0.14 or 14%.
To find the probability that a randomly selected person in the region is a woman in the 18-24 age range living alone, we need to look at the intersection of the "Female" row and the "0-24" age column in the table.
The probability of selecting a woman in the 18-24 age range living alone is:
P(woman, 18-24, living alone) = (Number of women in the 18-24 age range living alone) / (Total number of people living alone)
From the table, we can see that the number of women in the 18-24 age range living alone is 20.9. The total number of people living alone is 153.6.
P(woman, 18-24, living alone) = 20.9 / 153.6
P(woman, 18-24, living alone) = 0.1362 or approximately 0.14
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The complete question:
The table shows the distribution, by age and gender, of the million people in a certain region who live alone. Use the data in the table to find the probability that a randomly selected person in the region is a woman in the 1824 age range living alone. Age |0-24|25-49|50+ |Total
Male|21.9|25.3 |28.6|75.8
Fem |20.9|26.1 |30.8|77.8
Tot |42.8|51.4 |59.4|153.6
A
Find the measure of each side indicated.
Round to the nearest tenth.
8)
X
5 C
58°
B
The value of the measure of each side indicated are,
⇒ x = 12.48
⇒ BC = 16
We have to given that;
In triangle ABC;
AC = x
AB = 10
Hence, We can formulate;
⇒ tan 58° = BC / AB
⇒ 1.60 = BC / 10
⇒ BC = 16
By using Pythagoras theorem;
⇒ x² + 10² = 16²
⇒ x² = 256 - 100
⇒ x² = 156
⇒ x = 12.48
Thus, The value of the measure of each side indicated are,
⇒ x = 12.48
⇒ BC = 16
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One month Eric rented 3 movies and 5 video games for a total of $34. The next month he rented 9 movies and 7 video games for a total of $56. Find the rental
cost for each movie and each video game.
Rental cost for each movie:
Rental cost for each video game:
G
O
G
movies 1.75 each
games 5.75 each
Use the trapezoid shown to new each statement below as true or false, if false rewrite the statement correctly in the space below the statement.
Note that the perimeter of the trapezoid shown is 23 units. Thus, the statement is false.
How so you arrive at that?To derive the perimeter we must know the following:
a = base = 5
b = base = 8
d = side = 4
c is the hypotenuse" = (h x base of the right triangle) = (4x3)/2 = 6
Thus, Perimeter of the trapezoid = a + b + c + d =
5 + 8 + 4 + 6
= 23 units.
Thus, the statement that the perimeter of the trapezoid shown is 22 units is false.
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Full Question>
Use the trapezoid shown to mark each statement below as true or false. if false, please rewrite the statement correctly in the space below the statement!
Q: The perimeter of the trapezoid shown is 22 units.
True false?
List at least five combinations of nickels and dimes such that the total value of the coins is 80 cents.
Here are five combinations of nickels and dimes that add up to 80 cents:
4 dimes and 4 nickels
3 dimes and 7 nickels
2 dimes and 12 nickels
1 dime and 16 nickels
8 dimes and 4 nickels
Bozo can read at a rate of 300 words every four minutes. what is his rate of reading in words per minute?
Answer:
Bozo's rate of reading in words per minute is 75 (300 words / 4 minutes = 75 words/minute).
Step-by-step explanation:
Mark Brainliest!!
Answer: 75 words per minute
Step-by-step explanation:
We will divide 300 words by 4 to find the rate of words per minute since the original rate is words per four minutes.
300 / 4 = 75 words per minute
Mitra drives her car 469.8 miles and uses 14.5 gallons of gasoline. Adira drives her car 355 miles and uses 12.5 gallons of gasoline. What is the difference between the gas mileage for Mitra's car (in miles per gallon) and the gas mileage for Adira's car (in miles per gallon)?
A) 2 miles per gallon
B) 4 miles per gallon
C) 8 miles per gallon
D) 9 miles per gallon
Answer:
4 miles per gallon. Answer choice B is correct.
Step-by-step explanation:
To find the gas mileage for each car, we need to divide the distance traveled by the amount of gasoline used.
For Mitra's car, the gas mileage is:
gas mileage = distance traveled / amount of gasoline used
gas mileage = 469.8 / 14.5
gas mileage = 32.4 miles per gallon
For Adira's car, the gas mileage is:
gas mileage = distance traveled / amount of gasoline used
gas mileage = 355 / 12.5
gas mileage = 28.4 miles per gallon
To find the difference in gas mileage, we can subtract the gas mileage for Adira's car from the gas mileage for Mitra's car:
difference = gas mileage for Mitra's car - gas mileage for Adira's car
difference = 32.4 - 28.4
difference = 4 miles per gallon
Therefore, the difference in gas mileage between the two cars is 4 miles per gallon. Answer choice B is correct.
-2 square root of 2r +5=6
Evaluating the square root expression -2√(2r + 5) = 6 gives r = 2
Evaluating the square root expressionFrom the question, we have the following expression that can be used in our computation:
-2 square root of 2r +5=6
Express properly
So, we have
-2√(2r + 5) = 6
Divide by -2
√(2r + 5) = -3
So, we have
2r + 5 = 9
Subtract 5 from both sides
2r = 4
Divide
r = 2
Hence, the solution is 2
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3×2×1+3+8+6+7-9-9÷7×0×1=?
Answer:
3 × 2 × 1 + 3 + 8 + 6 + 7 - 9 - 9 ÷ 7 × 0 × 1
= 6 + 3 + 8 + 6 + 7 - 9 - 0
= 31 - 9
= 22
Therefore, the value of the expression is 22
A marble is selected at random from a jar containing 10 red marbles, 50 yellow marbles, and 40 green marbles. Find the theoretical probability that it is
either red or green.
P(red or green) = (Type an integer or a simplified fraction.)
Answer:0.5.
Step-by-step explanation:
Answer:
0.5
Step-by-step explanation:
hope this helps
an octagonal prism has a surface area of 50mm^2 and a volume of 88 mm^3 Another octagonal prism has a surface area of 450mm^2 and a volume of 792mm^3. Are these two shapes similar ? Explain your answer
The two octagonal prisms are similar because their corresponding sides are proportional.
How do we determine the octagonal prisms are similar?We can find out if two octagonal prisms are similar by checking if they have the same shape but may be different sizes. Two shapes are similar if their corresponding sides are proportional, and their corresponding angles are congruent.
Let's represent the dimensions of octagonal prism1:
Base edge length = a
Height = h
The octagonal prism2 dimensions:
Base edge length = b
Height = k
From the surface area and volume equations of an octagonal prism, we have the following system of equations:
50 = 2a² + 8ah
88 = 2a²h
450 = 2b² + 8bk
792 = 2b²k
We can simplify these equations by dividing the second equation by the first, and the fourth equation by the third, to eliminate h and k:
88/50 = 2a²h / (2a² + 8ah) => 44/25 = h / (a + 2h)
792/450 = 2b²k / (2b² + 8bk) => 44/25 = k / (b + 2k)
Then, we rearrange the equations to obtain expressions for h and k in terms of a and b, respectively:
h = (44/25) * (a + 2h)
k = (44/25) * (b + 2k)
Multiplying both sides of each equation by 25/19, we obtain:
h = (44/19) * a
k = (44/19) * b
We can now check if the corresponding sides are proportional:
Base edge length = a:b = 1:3
Height = h:k = 1:3
Since the corresponding sides are proportional, the two octagonal prisms are similar.
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Rectangle ABCD is shown on the coordinate plane below. What is the perimeter of rectangle ABCD? If necessary, round your answer to the nearest tenth.
The area of the given rectangle is 34 squared units.
How to find the area of the rectangleDetermining the area of a rectangle with the coordinates
A(-5, 3), B(3, 5), C(4, 1), and D(-4, -1)can be achieved through using the distance formula to calculate the magnitude of its sides and then applying the formula for the area pf rectangle we find the area.
Length of Side AB:
= square root of [(3 - (-5))^2 + (5 - 3)^2]
= square root of 68
Length of Side BC:
= square root of [ (4-3)^2 + (1 - 5)^2]
= square root of 17
Area of this rectangle
= side AB × Side BC
= square root[68] x square root[17]
= square root of [68 times 17]
= square root of 1156
= 34 Square Units
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Find the average of 327 and 827
Answer:
577
Step-by-Step Explanation:
577 is right between 327 and 827.
327+827=1,154
1,154/2=577
Please answer asap!! what is the equation that best models the data from the table after the data has been linearized?
The equation that best models the data from the table after the data has been linearized is y=294755 * 1.21728^x. This equation follows an exponental model.
When is the exponential model best used for an equation?Looking at the data, it is very evident that it is not increasing linearly but rather exponentially.
An exponential equation has the general pattern of formula which y = ab^x, where a is the main value and b is the growth factr.
The question below is as seen in the picture, and the above answer is dependent on it.
What is the equation that best models the data from the table after the data has been linearized?
X y
2 4.4
7 18.2
13 120.0
19 715.4
22 1,768.3
26 5,775.9
30 10.508.5
(1 point)
logy=0.12502x+0.427231
y=1,350 76x+1,350.76
y=294755 * 1.21728^x
y=5,927 281og x-3,880 59
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What is the value of x in the equation 4x+2x-3=15?
Answer:
x = 3
Step-by-step explanation:
4x + 2x - 3 = 15 ← collect like terms on left side
6x - 3 = 15 ( add 3 to both sides )
6x = 18 ( divide both sides by 6 )
x = 3
Answer:
x=3
Step-by-step explanation:
You can start of by adding 4x and 2x because they both share the same variable "x". Now you have 6x-3=15. Using the addition property of equality, you can add 3 on both sides of the equation to cancel it out. You are left with 6x=18. Divide both sides by 6 and that leaves you with x=3
dude what is this i dont understand
Answer:
g(1) = 1
Step-by-step explanation:
the absolute value function always gives a positive result, that is
| - a | = | a | = a
to evaluate g(1) substitute x = 1 into g(x)
g(1) = - 3| 1 - 2| + 4
= - 3| - 1| + 4
= - 3(1) + 4
= - 3 + 4
= 1
perimeter of a tabe is 228 inches and the length is 18 inches which is more than twice the width. How do I find the length and width of the worktable
The length of the worktable is 82 inches and the width is 32 inches.
To find the length and width of the worktable, we can use a system of equations. Let's denote the width of the table by w.
Since the length is 18 inches more than twice the width, we can write:
Length = 2w + 18
The perimeter of the table is the sum of all its sides, which in this case is the sum of the length and the width, each multiplied by 2:
Perimeter = 2(length + width)
Perimeter = 2(2w + 18 + w)
Perimeter = 2(3w + 18)
Perimeter = 6w + 36
We know that the perimeter is 228 inches, so we can set up an equation:
6w + 36 = 228
Solving for w, we get:
w = 32
Now that we know the width, we can use the equation for the length to find:
Length = 2w + 18
Length = 2(32) + 18
Length = 82
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PLEASE HELP (WILL GIVE BRAINLIEST)
Answer:
[tex] \sqrt{ {13.5}^{2} - {8.6}^{2} } = \sqrt{108.29} = 7 \sqrt{2.21} = \frac{7}{10} \sqrt{221} [/tex]
V = (1/2)(8.6)(.7√221)(22.4) = 1,002.33 square meters
The closest answer is 1,001.73 square meters.