What is -2 1/3 - (-5)?

The perimeter of rectangle A is k times the perimeter of rectangle B. Therefore, option C is the correct answer.

Here, we have,

Given that, rectangle A has a length and width that are k times the length and width of rectangle B.

We have,

The perimeter of a rectangle is the total distance of its outer boundary. It is twice the sum of its length and width and it is calculated with the help of the formula: Perimeter = 2(length + width).

Let the length of a rectangle A is L and the width of a rectangle A is W.

Let the length of a rectangle B is KL and the width of a rectangle A is KW.

Now, Perimeter of a rectangle A

= 2(L+W)

Perimeter of a rectangle B

= 2(KL+KW)

= 2K(L+W)

The perimeter of rectangle A is k times the perimeter of rectangle B. Therefore, option C is the correct answer.

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complete question:

If rectangle A has a length and width that are k times the length and width of rectangle B, which statement is true?

A. the perimeter of rectangle A is 2k times the perimeter of rectangle B.

B. the perimeter of rectangle A is k^2 times the perimeter of rectangle B.

C. the perimeter of rectangle A is k times the perimeter of rectangle B.

D. the perimeter of rectangle A is k^3 times the perimeter of rectangle B.

The ball will return to the ground after approximately 4.5 seconds.

To find the time it takes for the ball to return to the ground, we need to determine when the height of the ball is zero. In other words, we need to solve the equation f(t) = 54t - 12t² = 0.

Let's set the equation equal to zero and solve for t:

54t - 12t² = 0

Factoring out common terms:

t(54 - 12t) = 0

Now, we have two possible solutions for t:

t = 0

This solution represents the initial time when the ball was thrown.

54 - 12t = 0

Solving this equation for t:

54 - 12t = 0

12t = 54

t = 54 / 12

t = 4.5

So, the ball will return to the ground after approximately 4.5 seconds.

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Given that 14% of students speak Spanish, 7% speak French, and 4% speak both languages, the probability can be determined as 0.286 (option B).

Let's denote the event "speaks Spanish" as S and the event "speaks French" as F. We want to find the probability of F given S, denoted as P(F|S).

Using conditional probability, we have the formula:

P(F|S) = P(F ∩ S) / P(S)

Given that 14% speak Spanish (P(S) = 0.14), 7% speak French (P(F) = 0.07), and 4% speak both languages (P(F ∩ S) = 0.04), we can substitute these values into the formula:

P(F|S) = P(F ∩ S) / P(S) = 0.04 / 0.14 = 0.286

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Answer:

Step-by-step explanation:

The random variable described is discrete, as the number of pets a family can have can only take on whole number values.

It cannot take on non-integer values such as 2.5 pets or 3.7 pets. The possible values for this random variable are 0, 1, 2, 3, and so on, up to some maximum number of pets that a family might have.

Since the number of pets can only take on a countable number of possible values, this is a discrete random variable.

In contrast, a continuous random variable can take on any value within a range, such as the height or weight of a person, which can vary continuously.

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a)  The required answer is 2.5% of smartphone users are greater than 53 years old.

To find the percentage of smartphone users greater than 53 years old, we can use the 68-95-99.7 Rule, which refers to the empirical rule for normal distributions. The given mean is 37 years, and the standard deviation is 8 years.

Step 1: Calculate the z-score for 53 years old.
z = (53 - 37) / 8 = 2

A z-score of 2 means the age of 53 is 2 standard deviations above the mean. According to the 68-95-99.7 Rule, approximately 95% of the data falls within 2 standard deviations of the mean (above and below).

The sample mean error is the deviation of the set of means an infinite number of repeated samples from the population.

We are known as mean in mathematics especially in statistics. Its location covered mean median and mode,

Generally means include power mean and f- mean, the function of a mean and angles and cyclical quantities.      

Step 2: Calculate the percentage of users greater than 53 years old.
Since 95% of users are within 2 standard deviations (both above and below), this means that the remaining 5% of users are either below 2 standard deviations (younger than 29 years) or above 2 standard deviations (older than 53 years). As the data is symmetric, we can divide 5% by 2 to get the percentage of users older than 53 years old.z

Answer: 5% / 2 = 2.5% of smartphone users are greater than 53 years old.

b)  The required answer is 95% of smartphone users are between 29 and 53 years old.

To find the percentage of smartphone users between 29 and 53 years old, we know that both ages are 2 standard deviations from the mean (one below and one above).

A measure of the amount of variation or dispersion of a set of values are called standard deviation.

standard deviation  indicates the value is tend to be close to the mean.

Its deviation of a population or sample and a statics are quite different but relate.

The sample mean error is the deviation of the set of means an infinite number of repeated samples from the population.

We are known as mean in mathematics especially in statistics. Its location covered mean median and mode,

Generally means include power mean and f- mean, the function of a mean and angles and cyclical quantities. There are three types of mean is Arithmetic mean ,  Geometric mean and Harmonic mean. The arithmetic mean of a list of numbers. The Geometric mean is an average and useful for sets of positive number. The Harmonic mean is an average is useful for set of numbers.

According to the 68-95-99.7 Rule, 95% of the data falls within 2 standard deviations of the mean (above and below).

Therefore, approximately 95% of smartphone users are between 29 and 53 years old.

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Answer:[tex]\sqrt{3}[/tex]/2

Step-by-step explanation:

Substitute the value of the variable into the expression and simplify.

The value of k'(-2) = 41

Using the product rule, k′(−2)=f(−2)g′(−2)h(−2)+f(−2)g(−2)h′(−2)+f′(−2)g(−2)h(−2). Substituting the given values, we get k′(−2)=(-5)(8)(3)+(-5)(-7)(-10)+(9)(-7)(3)= -120+350-189= 41.

The product rule states that the derivative of the product of two or more functions is the sum of the product of the first function and the derivative of the second function with the product of the second function and the derivative of the first function.

Using this rule, we can find the derivative of k(x) with respect to x. We are given the values of f(−2), f′(−2), g(−2), g′(−2), h(−2), and h′(−2). Substituting these values in the product rule, we can calculate k′(−2). Therefore, the derivative of the function k(x) at x=-2 is equal to 41.

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The singular points of the given differential equation: (t² - t - 6)x"' + (t+2)x' – (t-3)x= 0 is  t = -2,3 . So the correct answer is option A. The singular point(s) is/are t = -2,3.  Singular points refer to the values of the independent variable where the solution of the differential equation becomes singular.

To find the singular points of the given differential equation, we need to first write it in standard form:
(t²- t - 6)x"' + (t + 2)x' – (t - 3)x= 0
Dividing both sides by t² - t - 6, we get:
x"' + (t + 2) / (t²- t - 6)x' – (t - 3) / (t²- t - 6)x = 0

Now we can see that the coefficients of x" and x' are both functions of t, and so the equation is not in the standard form for identifying singular points. However, we can use the fact that singular points are locations where the coefficients of x" and x' become infinite or undefined.

The denominator of the coefficient of x' is t²- t - 6, which has roots at t = -2 and t=3. These are potential singular points. To check if they are indeed singular points, we need to check the behavior of the coefficients near these points.

Near t=-2, we have:
(t + 2) / (t²- t - 6) = (t + 2) / [(t + 2)(t - 3)] = 1 / (t - 3)
This expression becomes infinite as t approaches -2 from the left, so -2 is a singular point.

Near t=3, we have:
(t + 2) / (t²- t - 6) = (t + 2) / [(t - 3)(t + 2)] = 1 / (t - 3)
This expression becomes infinite as t approaches 3 from the right, so 3 is also a singular point.

Therefore, the singular points of the given differential equation are t=-2 and t=3. The correct answer is A. The singular point(s) is/are t = -2,3.

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The correct answer is "b. t-test for a single sample". This hypothesis-testing procedure is used to determine whether a sample mean is significantly different from a known population mean when the population variance is unknown.

The correct answer is "b. t-test for a single sample". This hypothesis-testing procedure is used to determine whether a sample mean is significantly different from a known population mean when the population variance is unknown. The t-test for a single sample is a statistical test that compares the sample mean to a hypothetical population mean, using the t-distribution. It helps researchers determine whether the sample mean is a reliable estimate of the population mean, or whether the difference between the two means is due to chance.

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The values of x, y and z that correspond to the critical point of the function f(x,y) 4x2 + 7x + 6y + 2y are  (-7/8, -3/2).

To find the values of x, y, and z that correspond to the critical point of the function f(x, y) = 4x^2 + 7x + 6y + 2y^2, we need to find the partial derivatives with respect to x and y, and then solve for when these partial derivatives are equal to 0.

Step 1: Find the partial derivatives
∂f/∂x = 8x + 7
∂f/∂y = 6 + 4y

Step 2: Set the partial derivatives equal to 0 and solve for x and y
8x + 7 = 0 => x = -7/8
6 + 4y = 0 => y = -3/2

Now, we need to find the value of z using the given equation c = za. Since we do not have any information about c, we cannot determine the value of z. However, we now know the critical point coordinates for the function are (-7/8, -3/2).

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it's 30

a.

The equation to graph the left side of the letter "V" is y = -3x - 6.

b.  The points for the right side are then (-4, -6) and (0, 6).

c. The equation to graph the right side of the letter "V" is y = 3x + 6.

a.

The slope-intercept form of a linear equation is  y = mx + b.

The  points (-4, 6) and (0, -6):

m = (change in y) / (change in x)

= (-6 - 6) / (0 - (-4))

= -12 / 4

= -3

the y-intercept (b):

6 = -3(-4) + b

6 = 12 + b

b = 6 - 12

b = -6

b.

We will use the points (-4, 6) and (0, -6) and reverse the sign of the y-values. The points for the right side will be  (-4, -6) and (0, 6).

c.

We find slope (m) using the points (-4, -6) and (0, 6):

m = (change in y) / (change in x)

= (6 - (-6)) / (0 - (-4))

= 12 / 4

= 3

The y-intercept (b):

-6 = 3(-4) + b

-6 = -12 + b

b = -6 + 12

b = 6

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Answer:

To find the Taylor polynomial t3(x) for the function f(x) = xe^(-7x) centered at the number a = 0, we will use the formula for the nth-degree Taylor polynomial:

t_n(x) = f(a) + f'(a)(x-a) + f''(a)(x-a)^2/2! + ... + f^n(a)(x-a)^n/n!

First, let's find the first few derivatives of f(x):

f(x) = xe^(-7x)

f'(x) = e^(-7x) - 7xe^(-7x)

f''(x) = 49xe^(-7x) - 14e^(-7x)

f'''(x) = -343xe^(-7x) + 147e^(-7x)

Next, let's evaluate these derivatives at a = 0:

f(0) = 0

f'(0) = 1

f''(0) = -14

f'''(0) = 147

Now we can substitute these values into the formula for t3(x):

t3(x) = f(0) + f'(0)x + f''(0)x^2/2! + f'''(0)x^3/3!

t3(x) = 0 + 1x - 14x^2/2 + 147x^3/6

t3(x) = x - 7x^2 + 49/2 x^3

Therefore, the third-degree Taylor polynomial for f(x) centered at a = 0 is t3(x) = x - 7x^2 + 49/2 x^3.

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The best way to assist students in their preparation for reading is by presenting them with the important concepts and vocabulary in the lesson and attempting to relate that information to their background knowledge.

This approach helps students activate their schemata, which are the mental structures that allow them to make sense of new information. Additionally, it is important to preview important vocabulary, which helps students understand the meaning of unfamiliar words in the text. Finally, asking students to monitor their comprehension as they read is also helpful in ensuring they are understanding and retaining the information. Providing easier material may not challenge students enough, which could hinder their ability to develop their schemata.

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The predicted number of times the pointer will land on section B in 1,000 trials can be determined by calculating the relative frequency of B based on the recorded results of 50 spins.

To find the relative frequency, we divide the number of times the spinner landed on B by the total number of spins. In this case, let's assume that the spinner landed on section B, say, 10 times out of the 50 recorded spins.

To predict the number of times the pointer will land on B in 1,000 trials, we can use the ratio of the number of spins for B in 50 trials to the total number of spins in 1,000 trials.

Thus, the predicted number of times the pointer will land on section B in 1,000 trials would be:

Predicted number of times on B = (Number of times on B in 50 trials / Total number of spins in 50 trials) * Total number of spins in 1,000 trials

Let's assume the spinner landed on B 10 times in the 50 recorded spins. The calculation would be:

Predicted number of times on B = (10 / 50) * 1,000 = 200

Therefore, the predicted number of times the pointer will land on section B in 1,000 trials is 200.

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The integral [tex]\int_0^8 (x - x^3) dx[/tex] does not represent the area under the curve [tex]$y = x - x^3$[/tex] from 0 to 8 i.e., the given statement is false.

The integral [tex]$\int_0^8 (x - x^3) dx$[/tex] represents the definite integral of the function [tex]$y = x - x^3$[/tex] over the interval [0, 8]. This integral calculates the signed area between the curve and the x-axis over that interval. However, it does not represent the area under the curve itself.

To find the area under the curve, we need to take the absolute value of the integrand.

The integrand [tex]$x - x^3$[/tex] can be negative for certain values of x, which would result in a negative contribution to the signed area.

By taking the absolute value of the integrand, we ensure that we only consider the magnitude of the area.

Therefore, to find the actual area under the curve [tex]$y = x - x^3$[/tex] from 0 to 8, we need to evaluate [tex]$\int_0^8 |x - x^3| dx$[/tex]. This integral will give us the true area enclosed by the curve and the x-axis over the specified interval.

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The solution set for the logarithmic equation log3(x + 21)-log3(x-5)=3 is x=9.

To solve the logarithmic equation log3(x + 21)-log3(x-5)=3, we can use the quotient rule of logarithms to rewrite the equation as log3[(x + 21)/(x-5)]=3. We know that the domain of a logarithmic function is only valid for positive values inside the parenthesis. Therefore, we must reject any value of x that makes the denominator (x-5) equal to 0. So, x cannot be equal to 5.

Next, we can rewrite the equation without logarithms as 3=3 log3[(x + 21)/(x-5)]. Using the property that a log a(x)=x, we can simplify the equation as 3=(x + 21)/(x-5)³. Multiplying both sides by (x-5)³, we get 3(x-5)³ = x+21.

Expanding the left side of the equation and simplifying, we get 3x³ - 72x² + 498x - 1089 = 0. We can then solve for x using synthetic division or long division, which gives us the solution x=9.

However, we must check if x=9 is a valid solution by plugging it back into the original equation. Since log3(9+21) = log3(30) and log3(9-5) = log3(4), we can simplify the original equation as log3(30/4) = log3(15/2) = 3. Therefore, x=9 is a valid solution.

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Rounding up to the nearest whole number, you would need to survey approximately 753 randomly selected air passengers to be 90% confident that the sample percentage is within 3.5 percentage points of the true population percentage.

To determine the sample size needed for estimating a population percentage with a specified margin of error and confidence level, we can use the formula for sample size calculation for proportions. The formula is:

n = (Z^2 * p * (1-p)) / E^2

Where:

n is the required sample size,

Z is the Z-score corresponding to the desired confidence level (for a 90% confidence level, Z ≈ 1.645),

p is the estimated population proportion (since we don't have an estimate, we can use 0.5 for maximum sample size),

E is the desired margin of error (in decimal form).

In this case, the desired margin of error is 3.5 percentage points, which is 0.035 in decimal form.

Plugging in the values, we have:

n = (1.645^2 * 0.5 * (1-0.5)) / 0.035^2

Calculating this expression gives us:

n ≈ 752.93

Rounding up to the nearest whole number, you would need to survey approximately 753 randomly selected air passengers to be 90% confident that the sample percentage is within 3.5 percentage points of the true population percentage.

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Step-by-step explanation:

The diagonal is bisected by the other diagonal

Soooo:

5x = 6x -7

x = 7

Given, radius of a flying disc = 7.6 cm To find: Approximate area of the disc Area of the disc is given by the formula: Area = πr²where, r is the radius of the discπ = 3.14Substituting the given value of r, we get: Area = 3.14 × (7.6)²= 3.14 × 57.76= 181.3664 square centimeters Therefore, the approximate area of the disc is 181.

3664 square centimeters. Option (C) is the correct answer. More than 250 words: We have given the radius of a flying disc as 7.6 cm and we need to find the approximate area of the disc. We can use the formula for the area of the disc which is Area = πr², where r is the radius of the disc and π is the constant value of 3.14.The value of r is given as 7.6 cm. Substituting the given value of r in the formula we get the area of the disc as follows: Area = πr²= 3.14 × (7.6)²= 3.14 × 57.76= 181.3664 square centimeters Therefore, the approximate area of the disc is 181.3664 square centimeters.

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The derivative of the function g(s) is:

g'(s) = 2 ∫(t - t^9)^6 (1 - 9t^8)^(-1) dt

To apply Part 1 of the Fundamental Theorem of Calculus, we need to first express the function as an integral with a variable upper limit of integration.

We can do this by letting u = t - t^9, so du/dt = 1 - 9t^8. Solving for dt, we get dt = du / (1 - 9t^8).

Substituting this into the integral, we have:

g(s) = 2s ∫(t - t^9)^6 dt

= 2s ∫u^6 (1 - 9t^8)^(-1) du

Now we can differentiate g(s) with respect to s using the chain rule and Part 1 of the Fundamental Theorem of Calculus:

g'(s) = d/ds [2s ∫u^6 (1 - 9t^8)^(-1) du]

= 2 ∫u^6 (1 - 9t^8)^(-1) du

Note that since the integral is with respect to u, we can treat (1 - 9t^8)^(-1) as a constant with respect to u, so we can pull it out of the integral.

Taking the derivative of the integral with respect to s just leaves us with the constant factor of 2.

Therefore, the derivative of the function g(s) is:

g'(s) = 2 ∫(t - t^9)^6 (1 - 9t^8)^(-1) dt

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The line integral of F over the unit circle C is zero:

∮C F · dr = ∬D curl(F) · dA = 0

Hence, the answer is zero.

To use Green's theorem to evaluate the line integral of the given function around the unit circle, we need to first find its equivalent double integral over the region enclosed by the circle.

Green's theorem relates the line integral of a vector field over a closed curve to the double integral of the curl of the same vector field over the region enclosed by the curve.

Let's consider the vector field [tex]F = (0, 0, xy^2).[/tex]

Its curl is given by:

curl(F) = (∂Q/∂x - ∂P/∂y) i + (∂P/∂x + ∂Q/∂y) j + (∂R/∂x - ∂Q/∂y) k

= (0 - 0) i + (0 + 0) j + (0 - 2xy) k

= -2xy k

Here, P = 0, Q = 0, and[tex]R = xy^2[/tex] are the components of the vector field F.

Now, we can apply Green's theorem to evaluate the line integral of F over the unit circle C:

∮C F · dr = ∬D curl(F) · dA

where D is the region enclosed by the unit circle C and dA is the area element in the xy-plane.

Since the unit circle is given by[tex]x^2 + y^2 = 1,[/tex]  we can use polar coordinates to evaluate the double integral:

∬D curl(F) · dA = ∬D (-[tex]2r^3[/tex] sin θ cos θ) r dr dθ

= -2 ∫[0,2π] ∫[0,1] [tex]r^4[/tex]sin θ cos θ dr dθ

= 0 (since the integrand is odd in sin θ).

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Therefore, the general power series solution of the differential equation y'' + 3y' = 0, expanded at t0 = 0, is: y(t) = c_0 + c_1 t - (3/2) c_1 t^2 + (9/8) c_1 t^3 - (15/48) c_1 t^4 + ... + (-1)^n (3/(n+2)) c_(n+1) t^(n+2) + ... where c_0 and c_1 are arbitrary constants.

To find the power series solution of the given differential equation, we assume that the solution can be expressed as a power series:

y(t) = ∑(n=0 to ∞) c_n t^n

where c_n is the nth coefficient to be determined.

Taking first and second derivatives of y(t) with respect to t, we get:

y'(t) = ∑(n=1 to ∞) n c_n t^(n-1)

y''(t) = ∑(n=2 to ∞) n(n-1) c_n t^(n-2)

Substituting these expressions into the differential equation, we get:

∑(n=2 to ∞) n(n-1) c_n t^(n-2) + 3∑(n=1 to ∞) n c_n t^(n-1) = 0

Shifting the index of the first summation to start from n=0, we get:

∑(n=0 to ∞) (n+2)(n+1) c_(n+2) t^n + 3∑(n=0 to ∞) (n+1) c_(n+1) t^n = 0

We can simplify this expression by setting the coefficients of each power of t to zero:

(n+2)(n+1) c_(n+2) + 3(n+1) c_(n+1) = 0, for n ≥ 0

Simplifying this expression further, we get:

c_(n+2) = -(3/((n+2)(n+1))) c_(n+1), for n ≥ 0

This gives us a recursive formula for the coefficients c_n in terms of c_0 and c_1:

c_(n+2) = -(3/(n+2)) c_(n+1), for n ≥ 0

c_0 and c_1 are arbitrary constants.

To find the power series solution expanded at t0 = 0, we need to set c_0 = y(0) and c_1 = y'(0) and solve for the remaining coefficients using the recursive formula.

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Answer: Have you ever been really scared of something that doesn't usually happen? What were you scared of, and why?

Step-by-step explanation:

Answer:

Step-by-step explanation:

Have you ever been afraid of something that would probably never happen?

Mathematically-probability is a part of math.

EX.

Maybe afraid of getting thousands of spider bites at school.   It's improbable(not likely to happen, the probability is very low), because there probably aren't thousands of spiders at your school.

Or

Maybe you live in alaska and your afraid of getting a snake near you.  But snakes would probably not live in alaska so it's unlikely you'll encounter one.

To find the surface area of a triangular prism, you need to find the area of the triangular bases and add them to the areas of the rectangular sides.

Surface area of the triangular prism can be found out using the following steps:

Find the area of the triangle which is A, by the following formula.

A = 1/2 × b × hA

= 1/2 × 4 × 5A

= 10m²

Find the perimeter of the base (P) which can be calculated by adding the three sides of the triangle.

P = a + b + cP = 3 + 4 + 5P = 12m

Now find the area of each rectangle which can be calculated by multiplying the adjacent sides.A = LW = 5 × 3 = 15m²

Since there are two rectangles, multiply the area by 2.2 × 15 = 30m²Add the areas of the triangle and rectangles to get the surface area of the triangular prism:

Surface area = A + 2 × LW = 10 + 30 = 40m²

Therefore, the surface area of the given triangular prism is 40m².

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Answer:

yes

Step-by-step explanation:

The probability that z lies between -2.41 and 0 is approximately 0.9911.

To find the probability that a standard normal variable, z, falls within a specific range, we can use the standard normal distribution table or a statistical calculator.

In this case, we want to find the probability that z lies between -2.41 and 0. By referencing the standard normal distribution table or using a calculator, we can determine the area under the curve corresponding to this range. The resulting value represents the probability of z falling within that range.

Approximately 0.9911 is the probability that z lies between -2.41 and 0 when rounded to four decimal places. This means that there is a high likelihood (approximately 99.11%) that a randomly chosen value of z from a standard normal distribution falls within this range.

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(a) The Null-Hypotheses is H₀ : μ = 12, Alternate-Hypotheses is Hₐ : μ ≠ 12.

(b) The "test-statistic" is 10.36,

(c) The "p-value" is 0.0001,

(d) We make a decision to reject the "Null-Hypothesis",

(e) We conclude that the cans of "regular-Coke" have volumes with mean different from 12 ounces.

Part (a) : The "Null-Hypothesis" is that the mean volume of cans of regular Coke is 12 ounces, as stated on the label. The alternative-hypothesis is that the mean volume is different from 12 ounces.

So, H₀ : μ = 12

Hₐ : μ ≠ 12.

Part (b) : The "test-statistic" for a one-sample t-test is calculated as:

t = (x' - μ)/(s / √n),

where "s" = sample standard-deviation, μ = population mean, x' = sample mean, and n = sample size,

In this case, x' = 12.19, μ = 12, s = 0.11, and n = 36.

So, t = (12.19 - 12)/(0.11/√36) = 10.36,

Part (c) : We know that for "significance-level" of 0.01. The p-value is 0.0001.

Part (d) : Since the p-value is less than the significance-level of 0.01, we reject the null hypothesis.

Part (e) : Based on the results of the hypothesis test, we can conclude that there is sufficient evidence to suggest that cans of regular-Coke have volumes with a mean different from 12 ounces.

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The missing length in the given figure is 10 ft

In the figure there are two rectangle.

We have to find the missing length of the rectangle

The length of one rectangle is 16 ft.

The other length of rectangle is splitted to two parts

One length has 6 ft then the other length is 10 ft

Hence, the missing length in the given figure is 10 ft

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