The following data represent the age (in weeks) at which babies first crawl based on a survey of 12 mothers. The data are normally distributed and s=9.904 weeks. Construct and interpret a 90% confidence interval for the population standard deviation of the age (in weeks) at which babies first crawl. 31 39 36 38 51 48 55 Click the icon to view the table of critical values of the chi-square distribution. choice.
Select the correct choice below and fill in the answer boxes to complete your
(Use ascending order. Round to three decimal places as needed.) O
A. If repeated samples are taken, 90% of them will have the sample standard deviation between ___ and___
B. There is a 90% probability that the true population standard deviation is between ___ and ___
C. There is 90% confidence that the population standard deviation is between and___ and ___​

Hello!

A = 115° => opposite

B = 115° => corresponding angles

C = 65° => 180° - 115°

Answer:

A = 115 degrees

B = 115 degrees

C = 65 degrees

Step-by-step explanation:

A is opposite of 115 so it is 115 degrees.

B is 115 because it is on a parellel line to the one of 115

C is 180 minus B, which is 180 - 115 = 65

The values of m and c are m = 1 and c = 5.

The function f(x) is given by: f(x) = x + 5

To find the values of m and c in the function f(x) = mx + c, we can use the given information that f(0) = 5 and f(1) = 6.

Let's substitute x = 0 into the function:

f(0) = m(0) + c = 0 + c = c

We know that f(0) = 5, so c = 5.

Now let's substitute x = 1 into the function:

f(1) = m(1) + c = m + c = m + 5 = 6

Subtracting 5 from both sides, we have:

m + 5 - 5 = 6 - 5

m = 1

Therefore, the values of m and c are m = 1 and c = 5.

The function f(x) is given by:

f(x) = mx + c

f(x) = 1x + 5

f(x) = x + 5

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Answer:

caculations below

Step-by-step explanation:

A conveyor belt carries supplies from the first floor to the second floor which is 23 feet higher. The belt makes a 60-degree angle with the ground.

To calculate the distance traveled by the supplies from one end of the conveyor belt to the other, we can use the trigonometric function of sine.

sin(60) = opposite / hypotenuse

Here, the opposite side is the height difference between the two floors, which is 23 feet.

sin(60) = 23 / hypotenuse

To find the hypotenuse, we can rearrange the above equation:

hypotenuse = 23 / sin(60)

Using a calculator, we get:

hypotenuse = 26.5 feet

Therefore, the supplies travel approximately 26.5 feet from one end of the conveyor belt to the other.

Rounding the answer to the nearest foot, we get:

The supplies travel approximately 27 feet from one end of the conveyor belt to the other.

This is a simple one.

All you need to do is find the scale factor of the shapes. (How much has it decreased by?)

Wecan find this by doing 15 ÷ 20 (not the other way round because we want to find the scale factor for the bigger rectangle to the smaller)

15 ÷ 20 = 0.75

So to find the area all you need to do is times the area with the scale factor which is 0.75

500 x 0.75 = 375cm²

So the answer is

(A) 375cm²

The graph of the solution of the inequality is attached

From the question, we have the following parameters that can be used in our computation:

x - 4 < 5

Add 4 to both sides of the inequality

So, we have

x - 4 + 4 < 5 + 4

Evaluate the like terms

So, we have

x < 9

This means that the solution of the inequality is x < 9

See attachment for the graph

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Answer:

∠ 1 and ∠ 3 = 180°

Step-by-step explanation:

∠ 1 and ∠ 3 are same- side interior angles and sum to 180° , that is

∠ 1 + ∠ 3 = 180

While direct answers to iReady tasks are not provided, guidance for tackling problems involving unit rates and ratios with fractions was presented. The concept to calculate the unit rate involves dividing the first quantity by the second quantity. One should work towards solving these problems independently to reinforce the learning.

I'm sorry, but I cannot provide direct answers to your iReady task; it would not be fair or beneficial to your learning. However, I can guide you in how to tackle problems involving unit rates and ratios with fractions. With a unit rate, you're finding a ratio that compares a quantity to one unit of another quantity. The method typically involves dividing the first quantity by the second one.

For example, if you have a problem that says '6 cookies cost $1.50, what is the unit rate?', you would solve it by dividing 1.50 (the cost) by 6 (the number of cookies) to find the unit cost of a single cookie. This gives you a unit rate of $0.25 per cookie. If your questions on iReady involve complex fractions or operations, follow the same concept but use the relevant operation (multiplication, division, etc.). Practice moving toward solving these problems independently to improve your understanding of the concept.

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Hi,
cos[140˚- ( 50˚ + 30˚)] = 1/2
tan 240˚ = √3
cos 150˚ = -√3/2
sin 255˚ = -√6 - √2/4
Those above should be the correct ones
XD

The slope of line AD will be 4/3

Given,

ABCD is a square.

AB ⇒ y = -3/4 x + 7

Now,

AB is straight line.

Straight line equation ⇒ y =mx + c

m = slope of line

c = y intercept

Here,

m = -3/4 ( slope of line AB )

Now for slope of line AD,

ABCD is a square. Thus AB and AD are perpendicular to each other.

According the relation,

[tex]m_{1} m_{2} = -1[/tex]

[tex]m_{1}[/tex] = slope of line 1

[tex]m_{2}[/tex] = slope of line 2

So,

-3/4 [tex]m_{2}[/tex] = -1

[tex]m_{2}[/tex] = 4/3.

Hence slope of AD is 4/3 .

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The value of x is 8 units.

Given that a right triangle, with an altitude dividing the hypotenuse into 4 and 16 units,

The measure of the altitude is x we need to find the measure of the x,

So, according to the definition of similarity,

Their corresponding sides are proportional,

We get,

x / 4 = 16 / x

x² = 4 × 16

x² = 64

x = 8

Hence the value of x is 8 units.

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The measures of angle T and angle V are T = 90 and V = 90

From the question, we have the following parameters that can be used in our computation:

The circle

The point T and V are at the tangent of the circle

By definition, the tangent is perpendicular to the radius of the circle, with which it intersects.

This means that the angle T and angle V are right angled

Using the above as a guide, we have the following:

T = 90 and V = 90

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The number of cubic inches that the rectangular pyramid will hold if it has 15 inches height and 12 inches base is 720 inches³.

Here we have to find the volume of the pyramid since cubic unit means the volume.

We know that,

Volume of any pyramid = 1/3 × Base area × Height

Here the given pyramid is a rectangular pyramid.

Base of the pyramid will be a rectangle.

So, base area = length × width

Now given that,

Base is 12 inches.

Since there is only a dimension, width and length will be equal to 12 inches.

So base area = 12 × 12 = 144 inches²

Height = 15 inches

Volume of the pyramid = 1/3 × 144 × 15

                                       = 720 inches³

Hence the volume is 720 inches³.

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The frequency distribution that matches the data {3,8,5,6,4,3,7,8,9,5,5,6,4,12,14,10,8} is C.

Number

of Shoes   Frequency

3-5                   7

6-8                  6

9-11                 2

12-14              2

A frequency distribution is a frequency table or chart that visually displays the actual number of observations in each range or class or the percentage of the observations.

In this frequency distribution, the group 3-5 has the highest frequency of 7 followed by 6-8 with 6 frequencies.

3,8,5,6,4,3,7,8,9,5,5,6,4,12,14,10,8

Number

of Shoes   Frequency

3-5              IIIIIII        7

6-8              IIIIII         6

9-11             II             2

12-14           II             2

Total                        17

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The equation showing the problem is: 4x + 8y = 20

The graph is attached and the y intercept is (0, 2.5)

Assuming that:

Since Pedro walks at a rate of 4 miles per hour, the distance he covers by walking would be

Also Pedro runs at a rate of 8 miles per hour, the distance he covers by running would be

According to the given information, the total distance Pedro covers each week is 20 miles. Therefore, we can write the equation:

4x + 8y = 20

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The area of the shaded region is (133π/9) square feet.

Given that the radius (r) is 4 ft, the area of the entire circle is:

A = π(4)² = 16π ft²

To find the area of the sector, we need to calculate the fraction of the circle that the central angle represents.

The fraction is determined by dividing the measure of the central angle (110°) by the total angle in a circle (360°).

Fraction of the circle represented by the sector = 110° / 360° = 11/36

To find the area of the sector, we multiply the fraction by the area of the entire circle:

Area of the sector = (11/36) × (16π)

= (11π/9) ft²

Finally, to find the area of the shaded region, we subtract the area of the sector from the area of the entire circle:

Area of shaded region = Area of entire circle - Area of sector

Area of shaded region = 16π - (11π/9)

= (144π - 11π)/9

= (133π/9) ft²

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For each pound of the blend, Cold Beans should use 3 pounds of Guatemalan coffee.

This means that in a 6-pound bag of the blend, they would use [tex]3 \times 6 = 18[/tex]pounds of Guatemalan coffee.

Let's assume that x pounds of Guatemalan coffee are used per pound of the blend.

Given information:

Cost of Guatemalan coffee = $11/lb

Cost of the other coffee = $5/lb

Desired cost of the blend = $8/lb

Total weight of the blend = 6 pounds

To find the ratio of Guatemalan coffee to the total blend, we can set up the equation:

[tex](x \times 11 + (6 - x) \times 5) / 6 = 8[/tex]

In this equation, [tex](x \times 11)[/tex] represents the cost of the Guatemalan coffee in the blend, and[tex]((6 - x) \times 5)[/tex] represents the cost of the other coffee in the blend.

The numerator is the total cost of the blend, and we divide it by 6 (the total weight of the blend) to find the cost per pound.

Now, let's solve the equation for x:

(11x + 30 - 5x) / 6 = 8

6x + 30 = 48

6x = 48 - 30

6x = 18

x = 18/6

x = 3

Therefore, for each pound of the blend, Cold Beans should use 3 pounds of Guatemalan coffee.

This means that in a 6-pound bag of the blend, they would use [tex]3 \times 6 = 18[/tex]pounds of Guatemalan coffee.

To summarize, to achieve a cost of $8 per pound for a 6-pound bag of blend, Cold Beans should use 3 pounds of Guatemalan coffee per pound of the blend.

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Answer:

57

Step-by-step explanation:

this is the boybfiend

6.56 × [tex]10^{-7}[/tex] by 4.86×[tex]10^{-7}[/tex] is 3.18816 × [tex]10^{-13}[/tex] is factorize.

To find the product of 6.56 × [tex]10^{-7}[/tex] by 4.86×[tex]10^{-7}[/tex]. The conventions of scientific notation can be applied. To get 31.8816, we must first multiply the coefficients, which are 6.56 and 4.86. The exponents, which are -7 and -7, are then added to provide -14.

The product of 6.56 × [tex]10^{-7}[/tex] by 4.86 × [tex]10^{-7}[/tex] is 3.18816 × [tex]10^{-13}[/tex] This, according to the conventions of scientific notation, can be calculated by multiplying the coefficients and adding the exponents.

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Using trigonometric identities sin(x)/[1 - cos(x)] - sin(x)cos(x)/[1 + cos(x)] = csc (x)(1 + cos² (x)),

Trigonometric identities are equations that contain trigonometric ratios.

To verify the trigonometric identity

sin(x)/[1 - cos(x)] - sin(x)cos(x)/[1 + cos(x)] = csc (x)(1 + cos² (x)), we need to show that Left Hand Side, L.H.S equals Right Hand Side R.H.S. We proceed as follows.

L.H.S = sin(x)/[1 - cos(x)] - sin(x)cos(x)/[1 + cos(x)]

Taking the L.C.M, we have that

{sin(x)[1 + cos(x)] - sin(x)cos(x)[1 - cos(x)]}/[1 - cos(x)][1 + cos(x)]

Expanding the brackets, we have that

{sin(x) + sin(x)cos(x)] - sin(x)cos(x) + sin(x)cos²(x)]}/[1 - cos(x)][1 + cos(x)]

Simplifying, we have that

= {sin(x) + 0 + sin(x)cos²(x)]}/[1 - cos²(x)] Since ([1 - cos(x)][1 + cos(x)] = [1 - cos²(x)]

= {sin(x) + sin(x)cos²(x)]}/sin²(x)  [since sin²(x) = 1 - cos²(x)]

Factorizing out sinx in the equation, we have that

= {sin(x)(1 + cos²(x)]}/sin²(x)

= (1 + cos²(x)]}/sin(x)

= cosec(x)(1 + cos²(x)]}  (since cosec(x) = 1/sin(x))

= R.H.S

Since L.H.S = R.H.S, we have that

sin(x)/[1 - cos(x)] - sin(x)cos(x)/[1 + cos(x)] = csc (x)(1 + cos² (x))

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In 6 years Juan will have the double of Carlos age.

The ages of each one are:

Carlos = 18 years old.

Juan = 42 years old.

In x years, they will have:

C = 18 + x

J = 42 + x

Carlos will have the double of Juan's age when:

J = 2*C

Replacing the equations we will get the linear equation:

42 + x = 2*(18  + x)

Solving for x we will get:

42 +x = 36 + 2x

Solving for x:

42 - 36 = 2x - x

6 = x

So Juan will have the double of Carlos age in 6 years.

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The functions of the coefficients of the quadratic equation indicates that the correct statements are;

a. The y-intercept of the function is (0, c)

c. The coefficient b determines the horizontal shift of the parabola compared to the parent function

d. If a is negative, the parabola opens upwards

The quadratic equation is; y = a·x² + b·x + c

The functions of the coefficients of the above quadratic function are;

a = The scale factor, and the coefficient that determines the direction the projectile faces.

a < 1; Indicates that the graph is wider than the parent function

a > 1; Indicates that the graph is narrower than the parent function

a < 0; Indicates that the parabola opens downward

a > 0; Indicates that the parabola opens upwards

b = The coefficient b together with coefficients a and c determines the coordinate of the vertex of the graph of the quadratic function, which is; (-b/(2·a), -D/(4·a))

Where;

D = The discriminant

Therefore, b determines the x-value, and therefore, the horizontal shift of the parabola compared to the parent function

c = The y-coordinate of the y-intercept of the quadratic function, which is (0, c)

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Step-by-step explanation:

To multiply the polynomials (8v - 5)(v + 7), we can use the distributive property:

(8v - 5)(v + 7) = 8v(v + 7) - 5(v + 7)

Now we can simplify by multiplying each term:

8v(v + 7) - 5(v + 7) = 8v^2 + 56v - 5v - 35

Finally, we can combine like terms to get the simplified expression:

8v^2 + 51v - 35

Therefore, (8v - 5)(v + 7) = 8v^2 + 51v - 35.

The statement implies that the function f has a surjective property, ensuring full coverage of the target set Y.

The statement "If Y = ran(f), then f is a function onto Y" can be understood in the context of mathematical functions and their range.

In mathematics, a function is considered "onto" or "surjective" if every element in the target set (in this case, Y) has a pre-image in the domain set. In other words, for every element y in Y, there exists at least one element x in the domain set such that f(x) = y.

The given statement is saying that if Y is equal to the range of the function f, then f is a function that covers or maps onto every element in Y. In this case, the function f has a mapping for each element in the set Y, ensuring that no element in Y is left without a pre-image in the domain set.

Thus, the statement implies that the function f has a surjective property, ensuring full coverage of the target set Y.

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Answer: To rewrite the fractions 2/3 and 4/15 with the least common denominator (LCD), we need to find the smallest multiple that both denominators, 3 and 15, divide into evenly.

The prime factorization of 3 is 3, and the prime factorization of 15 is 3 * 5.

To find the LCD, we take the highest power of each prime factor that appears in either denominator. In this case, the highest power of 3 is 3, and the highest power of 5 is 5.

The LCD is the product of these highest powers: LCD = 3 * 5 = 15.

Now, we can rewrite the fractions with the least common denominator:

2/3 = (2/3) * (5/5) = 10/15

4/15 = (4/15) * (1/1) = 4/15

Therefore, the fractions 2/3 and 4/15 can be rewritten with the least common denominator as 10/15 and 4/15, respectively.

Step-by-step explanation:

The value of the given expression is,

[tex]4^{- 5/2[/tex] =  1/32

[tex](1/16) ^ {- 3/2[/tex] = 64

We have to given that,

Expressions to solve are,

⇒ [tex]4^{- 5/2[/tex]

And, [tex](1/16) ^ {- 3/2[/tex]

We  know that,

Exponentiation is the process of expressing huge numbers in terms of powers. That is, exponent refers to the number of times a number has been multiplied by itself

Now, We can simplify the given expression,

By using law of exponents

We get,

⇒ [tex]4^{- 5/2}[/tex]

⇒ [tex]2^{2(- 5/2)}[/tex]

⇒ 2⁻⁵

⇒ 1/2⁵

⇒ 1/32

Thus,

The value of   [tex]4^{- 5/2[/tex] =  1/32

The given expression is,

⇒[tex](1/16) ^ {- 3/2[/tex]

By using law of exponents

We get,

⇒ [tex]16 ^{3/2}[/tex]

⇒ [tex](4^2)^{3/2}[/tex]

⇒ 4³

⇒ 64

The value of  [tex](1/16) ^ {- 3/2[/tex] = 64

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The correct statements regarding the domain and the range of the functions are given as follows:

For the square root function, we have that:

Hence if we multiply the function by a negative number, the domain of the function remains constant, but the range is changed.

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The correct statement that explains the association between being male and favoring the color blue is:

B. There is a negative association because the number of males who chose blue is less than the number of females who chose blue.

In the given table, it can be observed that out of the total 90 students surveyed, 9 students (4 males and 5 females) decided the color blue as their favorite primary color. Since the number of males (4) who selected blue is less than the number of females (5) who chose blue, there is a negative association between being male and favoring the color blue.

Answer:

3840 pairs of shoes

Step-by-step explanation:

To write an exponential model that relates the number of shoes sold to the week number, we can use the general form of an exponential function:

y = a * b^x

where:

y is the number of shoes sold,

x is the week number, and

a and b are constants to be determined.

Given the information:

In week 0, 30 pairs of shoes were sold.

In week 3, 240 pairs of shoes were sold.

We can use these two data points to determine the values of a and b.

Using the data point for week 0:

30 = a * b^0

30 = a

Using the data point for week 3:

240 = 30 * b^3

8 = b^3

b = 2 (taking the cube root of both sides)

Therefore, the exponential model that relates the number of shoes sold to the week number is:

y = 30 * 2^x

To predict the number of shoes sold during week 7, we substitute x = 7 into the model:

y = 30 * 2^7

y = 30 * 128

y = 3840

Therefore, the model predicts that 3840 pairs of shoes will be sold during week 7.

The factored expression of n² - 11n + 10 is (n - 10)(n - 1)

From the question, we have the following parameters that can be used in our computation:

n² - 11n + 10

To determine the pair of factors to factor the expression, we find two expressions

using the above as a guide, we have the following:

The expressions are -10n and -n

So, we have

n² - 11n + 10 = n² - 10n - n + 10

When factored, we have

n² - 11n + 10 = (n - 10)(n - 1)

Hence, the factored expression of n² - 11n + 10 is (n - 10)(n - 1)

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