1 question, 3 parts, 3d trig will mark brainliest

Therefore, the surface represented by the given equation is a sphere centered at the origin with a radius of 6 units.

The given equation rho^2(sin^2(φ)sin^2(θ) + cos^2(φ)) = 36 represents a surface in spherical coordinates. Let's break down the equation to identify the surface:

ρ^2(sin^2(φ)sin^2(θ) + cos^2(φ)) = 36

Here, ρ represents the radial distance, φ is the polar angle, and θ is the azimuthal angle.

By analyzing the equation, we can see that it combines both the azimuthal and polar angles. The terms sin^2(φ)sin^2(θ) and cos^2(φ) involve both angles.

The equation ρ^2(sin^2(φ)sin^2(θ) + cos^2(φ)) = 36 describes a sphere centered at the origin with a radius of 6 units. The constant value of 36 indicates that the squared radial distance from the origin to any point on the surface is 36.

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To calculate the average speed of the train as it moves from position x = 50m to x = 60m, we can use the following formula:

Average Speed = (Total Distance) / (Total Time)

First, we need to determine the total distance traveled. In this case, the train moves from 50m to 60m, which is a distance of 10m:

Total Distance = Final Position - Initial Position
Total Distance = 60m - 50m
Total Distance = 10m

Next, we need to find the total time taken for this movement. Unfortunately, the given information is insufficient to determine the total time. Please provide more information about the train's motion, such as its velocity or acceleration, to accurately calculate the average speed.

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TRUE.

The Lorenz curve is a graphical representation of income distribution within a population. It plots the cumulative percentage of income received against the cumulative percentage of the population. The closer the Lorenz curve is to the diagonal line, the more evenly distributed income is within the population.

Conversely, if the curve is further from the diagonal, the greater the degree of income inequality. This is because a curve that is further from the diagonal indicates that a smaller percentage of the population holds a larger percentage of the income.

Therefore, if the Lorenz curve is closer to the diagonal, it suggests that the distribution of income is more equal within the population. In contrast, a curve that is further from the diagonal shows that income inequality is more pronounced.

Policymakers can use the Lorenz curve to evaluate the level of income inequality within a population and implement policies that aim to reduce the disparities between income earners.

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The two solutions for S² mod 104 are 1 and 40.

What are integers?

Integers are a type of number that includes all positive whole numbers (1, 2, 3, ...), zero (0), and negative whole numbers (-1, -2, -3, ...). In mathematical notation, the set of integers is denoted by the symbol Z.

To compute S² mod 104 using the Chinese Remainder Theorem, we need to first break down 104 into its prime factors:

104 = 2³ * 13

Next, we need to solve the congruences S² mod 8 and S² mod 13 separately.

Solving S² mod 8:

We note that 8 is a power of 2, so we can use the fact that any odd number squared is congruent to 1 mod 8. Thus, S² mod 8 is 1 if S is odd, and 0 if S is even.

Solving S² mod 13:

We can use Fermat's Little Theorem, which states that if p is a prime and a is not divisible by p, then [tex]a^{(p-1)}[/tex] is congruent to 1 mod p. Since 13 is prime and not a factor of 17, we have:

S² ≡ 17² ≡ 1 (mod 13-1)

S² ≡ 17² ≡ 1 (mod 12)

S² ≡ 1 (mod 13)

Now we need to combine the results using the Chinese Remainder Theorem. Let x and y be the solutions to S² mod 8 and S² mod 13, respectively. We need to solve the following system of congruences:

S² ≡ x (mod 8)

S² ≡ y (mod 13)

We can use the Extended Euclidean Algorithm to find integers a and b such that 8a + 13b = 1. In this case, one solution is a = 5 and b = -3. Then:

S² ≡ y8a + x13b (mod 813)

S² ≡ 185 + x(-3)*13 (mod 104)

S² ≡ 40 - 39x (mod 104)

Now we just need to substitute the possible values of x (0 or 1) to find the two solutions mod 104:

If x = 0, then S² ≡ 40 (mod 104)

If x = 1, then S² ≡ 1 (mod 104)

Therefore, the two solutions for S² mod 104 are 1 and 40.

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Hello !

[tex]3x + 4 = 2x - 1\\\\3x - 2x = -1 - 4\\\\x = -5[/tex]

x = -5

Answer:

[tex]\sf{x=-5}[/tex]

Step-by-step explanation:

Let's solve this equation.

Our equation is:

[tex]\sf{3x+4=2x-1}[/tex]

Rearrange the terms

[tex]\sf{3x-2x+4=1}[/tex]

[tex]\sf{3x-2x=-1-4}[/tex]

Combine

[tex]\sf{x=-5}[/tex]

Therefore, x = -5

Therefore, the correct answer is D. Upon inspection, we can see that sample A does not meet the condition for the chi-square test of independence. In the "D" column, both the curfew yes (1) and curfew no (1) expected cell counts are below 5. Thus, the conditions are not met for sample A to reliably perform the test.

To determine which sample does NOT meet the conditions to reliably perform a chi-square test of independence, we need to check for the assumption that at least 80% of the expected cell counts should be 5 or greater.

Let's analyze the samples:
A.)
 A B C D
curfew yes 10 28 15 1
curfew no 3 17 6 1
B.)
 A B C D
curfew yes 62 154 84 6
curfew no 16 131 31 8
C.)
 A B C D
Curfew yes 12 84 60 12
Curfew no 4 61 25 10
D.)
 A B C D
Curfew yes 10 15 20 5
Curfew no 5 20 15 10
Upon inspection, we can see that sample A does not meet the condition for the chi-square test of independence. In the "D" column, both the curfew yes (1) and curfew no (1) expected cell counts are below 5. Thus, the conditions are not met for sample A to reliably perform the test.

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To use the geometric series to give a series for 1/1 x, we can start with the formula for a geometric series:

S = a/(1-r)

where S is the sum of the series, a is the first term, and r is the common ratio.

In this case, we can let a = 1 and r = -1/x. Then, we have:

S = 1/(1-(-1/x)) = x/(x+1)

So, we have a series for 1/1 x:

1/1 x = x/(x+1)

To differentiate this series to give a series for [tex]1/(1 x)^2[/tex], we can use the power rule for differentiation. If we let y = 1/1 x, then:

dy/dx = [tex]x/(x+1)^2[/tex]

This gives us a series for [tex]1/(1 x)^2[/tex]:

[tex]1/(1 x)^2 = -x/(x+1)^2[/tex]
Given the terms "geometric series" and "differentiate," here's the solution to your question:

To find a series for 1/(1-x), we can use a geometric series with the formula:

Sum = a * [tex](1 - r^n) / (1 - r)[/tex]

In this case, the first term a is 1, and the common ratio r is x. Therefore, the geometric series becomes:

1/(1-x) = 1 * [tex](1 - x^n) / (1 - x) = 1 + x + x^2 + x^3 + ...[/tex]

Now, differentiate the series term by term to find the series for [tex]/(1-x)^2[/tex]:

d(1)/(dx) = 0, [tex]d(x^n)/(dx) = nx^(n-1)[/tex]

The differentiated series is:

[tex]0 + 1 + 2x + 3x^2 + 4x^3 + ...[/tex]

This is the series for [tex]1/(1-x)^2[/tex], as requested.

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We can use the Pythagorean identity one more time to get:

cos^2(a)t + cos^2(B) + cos^2(y) = 1

What is Trigonometry ?

Trigonometry is the branch of mathematics that studies the relationships between the sides and angles of triangles. Trigonometry is found throughout geometry because every shape with equal sides can be broken down into a collection of triangles.

The identity you want to prove is:

cos^2(a)t cos^2(B) + cos^2(y) = 1

We can start by using the Pythagorean identity for sine and cosine:

sin^2(x) + cos^2(x) = 1

cos^2(x) = 1 - sin^2(x)

We can use this identity to substitute for cos^2(a)t and cos^2(B):

cos^2(a)t cos^2(B) = (1 - sin^2(a)t)(1 - sin^2(B))

Expanding this expression, we get:

cos^2(a)t cos^2(B) = 1 - sin^2(a)t - sin^2(B) + sin^2(a)t sin^2(B)

Now we can substitute this expression back into the original identity:

cos^2(a)t cos^2(B) + cos^2(y) = 1

(1 - sin^2(a)t)(1 - sin^2(B)) + cos^2(y) = 1

Expanding the left side and simplifying, we get:

1 - sin^2(a)t - sin^2(B) + sin^2(a)t sin^2(B) + cos^2(y) = 1

sin^2(a)t sin^2(B) + cos^2(y) = sin^2(a)t + sin^2(B)

Now we can use the Pythagorean identity again:

sin^2(a)t + sin^2(B) = 1 - cos^2(a)t - cos^2(B)

Substituting this expression, we get:

sin^2(a)t sin^2(B) + cos^2(y) = 1 - cos^2(a)t - cos^2(B)

Finally, we can use the Pythagorean identity one more time to get:

cos^2(a)t + cos^2(B) + cos^2(y) = 1

which is the identity we wanted to prove.

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A standard bowling lane is approximately 60 feet long from the foul line to the head pin.

The metric system uses the terms kilometres (km), metres (m), decimeters (dm), centimetres (cm), and millimetres (mm) to describe length or distance.

A standard bowling lane is designed to be 60 feet in length from the foul line to the head pin. This distance is consistent across most bowling alleys and is a key measurement in the sport of bowling.

The 60-foot length is divided into specific sections that contribute to the overall structure of the lane. These sections include the approach area, the foul line, the lane itself, and the pin deck where the pins are set.

The approach area is the section where the bowler stands and prepares to release the ball. It usually spans around 15 feet, providing enough space for the bowler to take a few steps and build momentum before releasing the ball.

The foul line marks the boundary between the approach area and the actual lane. It is important for bowlers to release the ball before crossing the foul line; otherwise, it is considered a foul, and the resulting throw does not count towards the score.

Beyond the foul line is the lane, which is where the ball rolls towards the pins. The lane is typically around 41 to 42 inches wide, made of a specially coated wooden or synthetic surface that allows the ball to roll smoothly.

At the end of the lane is the pin deck, where the pins are arranged in a triangular pattern. The head pin, also known as the 1-pin, is positioned at the front of the triangle. When the ball reaches this area, it interacts with the pins, causing them to scatter or fall, resulting in a score.

Overall, the 60-foot length of a standard bowling lane provides enough distance for bowlers to exhibit skill and strategy in their throws while ensuring a fair and consistent playing field.

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[tex]11b-388 > 6(2-4b)-5b\\11b-388 > 12-24b-5b\\11b-388 > 12-29b\\11b+29b > 12+388\\40b > 400\\b > 400:40\\b > 10\implies \bf\red{\boxed{b\in (10;\:+\infty)}}[/tex]

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Therefore, the estimate of the area under the graph using six rectangles is approximately 144 square units.

To find estimates of the area under the graph using six rectangles, we divide the interval [0, 36] into six equal subintervals.

The width of each rectangle will be (36 - 0) / 6 = 6.

Let's denote the height of each rectangle by the value of the function f at the midpoint of each subinterval.

The six subintervals and their midpoints are:

[0, 6] with midpoint x = 3

[6, 12] with midpoint x = 9

[12, 18] with midpoint x = 15

[18, 24] with midpoint x = 21

[24, 30] with midpoint x = 27

[30, 36] with midpoint x = 33

We evaluate the function f at each midpoint to get the height of the rectangle and calculate the area of each rectangle by multiplying the height by the width.

Let's assume the function values at the midpoints are:

f(3) = 2

f(9) = 4

f(15) = 3

f(21) = 5

f(27) = 6

f(33) = 4

The area of each rectangle is given by:

Rectangle 1: 6 * 2 = 12

Rectangle 2: 6 * 4 = 24

Rectangle 3: 6 * 3 = 18

Rectangle 4: 6 * 5 = 30

Rectangle 5: 6 * 6 = 36

Rectangle 6: 6 * 4 = 24

To estimate the total area, we sum up the areas of all six rectangles:

Total area ≈ 12 + 24 + 18 + 30 + 36 + 24 = 144

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The average rate of change between year 1 and year 4 is $500-$100/(4-1) years = $400/3 years = $133.33 per year. This statement accurately calculates the average rate of change in cost.

To determine the correctness of the observations based on the graph, we need to carefully analyze the information presented.

Observation 1 states that the cost of maintaining the machine is constantly rising. However, this statement is incorrect as there is a flat spot and a downward trend from 4 to 6 years, indicating a decrease in maintenance costs during that period.

Observation 2 claims that the cost of maintenance is $300 for the first 3 years. This statement is also incorrect since the graph shows a rising trend in the cost during the first 3 years, and it is only in the third year that the cost reaches $300. The cost is not constant for the entire period.

Observation 3 states that the average rate of change between year 1 and year 4 is $400/400 = $100/year. This statement is incorrect because the change in time from year 1 to year 4 is actually 3 years, not 4. Therefore, the correct calculation would be $400/3 years, which is approximately $133.33 per year.

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Answer: 211,900

Step-by-step explanation:

First you have to simplify both sides of the equation. Starting on the right, 2,654 x 100 is 265,400. On the right, 35,000 + 50,000 is 85,000.

Now you have 85,000 + x = 265,400. All you have to do is subtract 85,000 from both sides.

This gives you x = 211,900.

The volume of the solid obtained by rotating the region enclosed by the curves [tex]y = x ^{\frac{1}{2} }[/tex] and y = x about the x-axis is [tex]\frac{\pi}{6}[/tex].

option A.

The volume of the solid obtained by rotating the region enclosed by the curves [tex]y = x ^{\frac{1}{2} }[/tex] and y = x about the x-axis is calculated as follows;

The limit of the integration is calculated as follows;

 [tex]y = x ^{\frac{1}{2} } = \sqrt{x}[/tex]

y = x

solve the two equation together;

x = √x

Square both sides of the equation;

x² = x

x² - x = 0

x(x - 1) = 0

x = 0 or  x - 1 = 0

x = 0 or 1

The radius of the solid formed is determined as;

[tex]r = (x^2 - x)[/tex]

when it is rotated, the radius of the solid; r = x - x²

The volume function of the solid is calculated as follows;

dv = 2πxr

dv = 2πx (x - x²)

The volume of the solid is calculated as;

[tex]V = \int\limits^1_0 {2\pi x (x - x^2) } \, dx \\\\V = 2\pi \int\limits^1_0 {x( x- x^2) } \, dx\\\\V = 2\pi \int\limits^1_0 { (x^2- x^3) } \, dx\\\\V = 2\pi [\frac{x^{3 }}{3} - \frac{x^4}{4} ]^1_0\\\\V = 2\pi [\frac{(1)^{3 }}{3} - \frac{(1)^4}{4} ]\\\\V = 2\pi (\frac{1}{12} )\\\\V = \frac{2\pi}{12} \\\\V = \frac{\pi }{6}[/tex]

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The correct statement about the electromagnetic spectrum is (d) the frequency of infrared radiation, which has a wavelength of 1.0 × 10³ nm, is twice that of radio waves, which have a wavelength of 1.0 × 10⁶ nm.

The speed of light in a vacuum is constant, so the speed of different types of electromagnetic waves is the same. Therefore, statement (a) is incorrect because the speed of x-rays and infrared radiation is the same.

The wavelength of visible radiation decreases as its color changes from red to violet, not from blue to green. Thus, statement (b) is incorrect.

The frequency of a wave is inversely proportional to its wavelength. Since infrared radiation has a shorter wavelength (1.0 × 10³ nm) compared to radio waves (1.0 × 10⁶ nm), it has a higher frequency. Therefore, statement (c) is incorrect.

On the other hand, statement (d) is correct because a shorter wavelength corresponds to a higher frequency. Thus, the frequency of infrared radiation (1.0 × 10³ nm) is indeed twice that of radio waves (1.0 × 10⁶ nm) due to the significant difference in their wavelengths.

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The value of the integral is:

∫[0 to 3] (1 + t^2) j + (4t^3)/(1 + t^4) k dt = 12 j + ln(82) k.

To evaluate the integral ∫[0 to 3] (1 + t^2) j + (4t^3)/(1 + t^4) k dt, we can compute the integral component-wise.

For the j-component:

∫[0 to 3] (1 + t^2) dt

Integrating term by term, we have:

∫[0 to 3] dt + ∫[0 to 3] t^2 dt

= [t] evaluated from 0 to 3 + [(1/3) t^3] evaluated from 0 to 3

= (3 - 0) + (1/3)(3^3 - 0^3)

= 3 + 9

= 12

For the k-component:

∫[0 to 3] (4t^3)/(1 + t^4) dt

Making a substitution u = 1 + t^4, du = 4t^3 dt, we have:

∫[1 to 82] (1/u) du

= ln|u| evaluated from 1 to 82

= ln|82| - ln|1|

= ln(82)

Therefore, the value of the integral is:

∫[0 to 3] (1 + t^2) j + (4t^3)/(1 + t^4) k dt = 12 j + ln(82) k.

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The sampling distribution of xbar for random samples of 40 observations from an extremely skewed population, such as exponential, is approximately normal.

The Central Limit Theorem (CLT) states that when random samples of sufficient size are drawn from any population, regardless of its distribution, the sampling distribution of the sample mean (xbar) tends to follow a normal distribution. This property holds true even when the population from which the samples are drawn is highly skewed.

In the case of an extremely skewed population, like the exponential distribution, the individual observations may be highly skewed and not normally distributed. However, as the sample size increases, the distribution of xbar becomes more and more bell-shaped and symmetric. This occurs because the averaging of a large number of observations tends to mitigate the effect of extreme values and smoothes out the distribution.

Therefore, when random samples of 40 observations are drawn from an extremely skewed population, the sampling distribution of xbar will be approximately normal. This allows us to make statistical inferences and use techniques that rely on the assumption of normality, such as confidence intervals and hypothesis tests, even when the underlying population distribution is highly skewed.

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In the regression analysis conducted on the data, the variables that are insignificant at a 5% level of significance are Age and Income.

This means that these variables do not have a statistically significant impact on the average mathematics test scores in the schools. To determine the significance of variables in the regression analysis, statistical tests such as t-tests or p-values are typically used. These tests help determine whether the coefficients associated with the variables are significantly different from zero. In this case, if the p-value associated with a variable is greater than the chosen significance level (in this case, 5%), it indicates that the variable is not statistically significant and does not have a significant impact on the average mathematics test scores.

From the given answer choices, the variables Age and Income are the ones identified as insignificant at the 5% level of significance. This implies that the mean age of the teachers and the mean annual income of the mathematics teachers do not have a significant influence on the average mathematics test scores in the schools.

It's important to note that this conclusion is based on the specific dataset and analysis conducted for the given scenario. The results may vary if different variables or additional data are considered.

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The probability that at most 2 out of 6 randomly sampled people from the city are unemployed is 0.8474, rounded to two decimal places.

To find the probability that at most 2 out of 6 randomly sampled people from the city are unemployed, we can use the binomial probability formula.

The formula for the probability of getting exactly x successes in n independent Bernoulli trials, each with a probability of success p, is:

[tex]P(X = x) = (nCx) * (p^x) * ((1-p)^{(n-x)})[/tex]

In this case, the number of trials n is 6, the probability of success (unemployment) p is 0.12 (12% as a decimal), and we want to find the probability for at most 2 unemployed people, so we sum up the probabilities for x = 0, 1, and 2.

P(X ≤ 2) = P(X = 0) + P(X = 1) + P(X = 2)

Let's calculate each probability:

[tex]P(X = 0) = (6C0) * (0.12^0) * (0.88^6) = 1 * 1 * 0.4177 = 0.4177[/tex]

[tex]P(X = 1) = (6C1) * (0.12^1) * (0.88^5) = 6 * 0.12 * 0.4437 = 0.3197P(X = 2) = (6C2) * (0.12^2) * (0.88^4) = 15 * 0.0144 * 0.5153 = 0.1100[/tex]

Now, let's calculate the cumulative probability:

P(X ≤ 2) = P(X = 0) + P(X = 1) + P(X = 2) = 0.4177 + 0.3197 + 0.1100 = 0.8474

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If the average velocity is doubled in turbulent flow through a square channel with smooth surfaces, the change in the head loss of the fluid can be determined by considering the relationship between the head loss and the friction factor. The correct answer is: The head loss decreases by a factor of 3.48.

The head loss in a fluid flow is proportional to the friction factor, and the friction factor is dependent on the average velocity. When the average velocity is doubled, the friction factor can be calculated using the given equation. By substituting the new velocity into the equation, we find that the new friction factor is approximately 0.184 * (2)^(-0.2) = 0.116.

Since the head loss is proportional to the friction factor, when the friction factor decreases from 0.184 to 0.116, the head loss decreases by a factor of 0.116/0.184 ≈ 0.631 or approximately 3.48. Therefore, the head loss decreases by a factor of 3.48.

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If the average velocity is doubled in turbulent flow through a square channel with smooth surfaces, the change in the head loss of the fluid can be determined by considering the relationship between the head loss and the friction factor. The correct answer is: The head loss decreases by a factor of 3.48.

The head loss in a fluid flow is proportional to the friction factor, and the friction factor is dependent on the average velocity. When the average velocity is doubled, the friction factor can be calculated using the given equation. By substituting the new velocity into the equation, we find that the new friction factor is approximately 0.184 * (2)^(-0.2) = 0.116.

Since the head loss is proportional to the friction factor, when the friction factor decreases from 0.184 to 0.116, the head loss decreases by a factor of 0.116/0.184 ≈ 0.631 or approximately 3.48. Therefore, the head loss decreases by a factor of 3.48.

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Answer:

2, 5, 7.

Step-by-step explanation:

call the smallest number A and the largest C.

we have A + B + C = 14.

Three times the smallest is 1 less than the largest:

3A = C - 1, C = 3A + 1.

sum of the largest and smallest is 9:

A + C = 9, C = 9 - A.

so we have C = 3A + 1 = 9 - A.

3A + A = 9 - 1

4A = 8

A = 2.

C = 9 - A = 9 - 2 = 7.

A + B + C = 14,

B = 14 - A - C = 14 - 2 - 7 = 5.

So A = 2, B = 5 and C = 7.

a. The Empirical Rule, also known as the 68-95-99.7 rule, states that for a normal distribution:

Approximately 68% of the data falls within one standard deviation of the mean.
Approximately 95% of the data falls within two standard deviations of the mean.
Approximately 99.7% of the data falls within three standard deviations of the mean.
For the given problem, the mean is 12 fl.oz. and the standard deviation is 0.16 fl.oz. Based on the Empirical Rule, we can draw the following values on the normal curve:

One standard deviation from the mean:

To the left: Mean - 1 standard deviation = 12 - 0.16 = 11.84 fl.oz.
To the right: Mean + 1 standard deviation = 12 + 0.16 = 12.16 fl.oz.
Two standard deviations from the mean:

To the left: Mean - 2 standard deviations = 12 - (2 * 0.16) = 11.68 fl.oz.
To the right: Mean + 2 standard deviations = 12 + (2 * 0.16) = 12.32 fl.oz.
Three standard deviations from the mean:

To the left: Mean - 3 standard deviations = 12 - (3 * 0.16) = 11.52 fl.oz.
To the right: Mean + 3 standard deviations = 12 + (3 * 0.16) = 12.48 fl.oz.

b. Using the Empirical Rule, we can determine the percentages of cans with volumes that fall within the specified ranges:

i. Under 12.16 fl.oz.:

Approximately 34% of the cans have volumes less than 12.16 fl.oz. (within one standard deviation of the mean).
ii. Over 11.52 fl.oz.:

Approximately 84% of the cans have volumes greater than 11.52 fl.oz. (within three standard deviations of the mean).
iii. Between 11.68 fl.oz. and 12.48 fl.oz.:

Approximately 68% of the cans have volumes within one standard deviation of the mean, which includes the range between 11.68 fl.oz. and 12.32 fl.oz.
Approximately 95% of the cans have volumes within two standard deviations of the mean, which includes the range between 11.68 fl.oz. and 12.48 fl.oz.
Note: These percentages are approximate and based on the assumptions of the Empirical Rule.

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To determine the p-value corresponding to a z-test statistic of 1.47 in a right-tailed test, we need to find the probability of obtaining a z-value equal to or greater than 1.47.

The p-value is the probability of observing a test statistic as extreme as, or more extreme than, the one calculated under the null hypothesis.

Using a standard normal distribution table or calculator, we can find the area to the right of 1.47. This area represents the probability of obtaining a z-value greater than 1.47.

Looking up the z-score of 1.47 in a standard normal distribution table, we find that the corresponding area is approximately 0.9292.

Since this is a right-tailed test, the p-value is equal to the area to the right of the test statistic. Therefore, the p-value is approximately 0.9292.

Thus, the p-value is approximately 0.9292 or 92.92%.

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C - 1,4,4

D - 2,2,4

The product of dimensions must give 16 as a result.

The number of ways to choose a dance committee of 8 students is 6,096,454 ways.

The number of ways to choose a dance committee with 2 freshmen, 2 sophomores, 2 juniors, and 2 seniors is 1,134,000 ways.

The number of ways to choose a dance committee with 4 juniors and 4 seniors is 12,870 ways.

The probability of selecting a committee consisting of 2 freshmen, 2 sophomores, 2 juniors, and 2 seniors is 0.186.

The probability of selecting a committee consisting of 4 juniors and 4 seniors is 0.002.

To solve these problems, we can use the concept of combinations. The number of ways to choose k items from a set of n items is given by the binomial coefficient, also known as "n choose k," denoted as C(n, k) or nCk.

In general, the formula for the binomial coefficient is:
C(n, k) = n! / (k! * (n - k)!)

Now, let's solve each problem:

In how many ways can a dance committee of 8 students be chosen?
We have a total of 35 eligible students (8 freshmen + 10 sophomores + 9 juniors + 8 seniors). To choose a committee of 8 students, we need to calculate C(35, 8):
C(35, 8) = 35! / (8! * (35 - 8)!)
= 35! / (8! * 27!)
Therefore, the number of ways to choose a dance committee of 8 students is:
35! / (8! * 27!) = 6,096,454 ways

In how many ways can a dance committee be chosen if it is to consist of 2 freshmen, 2 sophomores, 2 juniors, and 2 seniors?
We need to choose 2 students from each category. The number of ways can be calculated by multiplying the number of ways to choose 2 students from each category:
C(8, 2) * C(10, 2) * C(9, 2) * C(8, 2)
Therefore, the number of ways to choose a dance committee with 2 freshmen, 2 sophomores, 2 juniors, and 2 seniors is:
C(8, 2) * C(10, 2) * C(9, 2) * C(8, 2) = 1,134,000 ways

In how many ways can a dance committee be chosen if it is to consist of 4 juniors and 4 seniors?
We need to choose 4 juniors from the 9 available and 4 seniors from the 8 available. The number of ways can be calculated as:
C(9, 4) * C(8, 4)
Therefore, the number of ways to choose a dance committee with 4 juniors and 4 seniors is:
C(9, 4) * C(8, 4) = 12,870 ways

Probability of selecting a committee consisting of 2 freshmen, 2 sophomores, 2 juniors, and 2 seniors.
To find the probability, we need to divide the number of ways to choose the desired committee (as calculated in question 2) by the total number of ways to choose a committee of 8 students (as calculated in question 1):
Probability = (Number of ways to choose the desired committee) / (Total number of ways to choose a committee of 8 students)
Therefore, the probability of selecting a committee consisting of 2 freshmen, 2 sophomores, 2 juniors, and 2 seniors is:
1,134,000 / 6,096,454 ≈ 0.186

Rounded to the nearest thousandth, the probability is approximately 0.186.

Probability of selecting a committee consisting of 4 juniors and 4 seniors.
Similarly, to find the probability, we divide the number of ways to choose the desired committee (as calculated in question 3) by the total number of ways to choose a committee of 8 students (as calculated in question 1):
Probability = (Number of ways to choose the desired committee) / (Total number of ways to choose a committee of 8 students)
Therefore, the probability of selecting a committee consisting of 4 juniors and 4 seniors is:
12,870 / 6,096,454 ≈ 0.002

Rounded to the nearest thousandth, the probability is approximately 0.002.

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Answer:

12 mysteries, 6 non-fiction, 5 science fiction

Step-by-step explanation:

M = mysteries, NF = non-fiction, SF = science fiction.

x is number of mysteries books purchased, y is number of non-fiction, z is is number of science fiction.

Rory: xM + yNF + zSF = 7      (call this equation 1, or just '1')

Mary: xM + 4yNF + 2zSF = 14      (call this '2')

'2' - '1':  3yNF + zSF = 7

zSF = 7 - 3yNF.

Rory: xM + yNF + zSF = 7    (call this '3')

Pat: 3xM + 3yNF + 5zSF = 23        (call this '4').

3 X '3':  3xM + 3yNF + 3zSF = 21     (call this '5')

'4' - '5':  2zSF = 2, zSF = 1.    number of science fiction books is 1.

from earlier, zSF = 7 - 3yNF. that is, 1 = 7 - 3ySF,

3yNF = 6, yNF = 2. number of non-fiction books is 2.

going back to '1,' xM = 7 - yNF - zSF = 7 - 2 - 1 = 4.

number of mysterious books is 4.

in conclusion, Pat purchased 3(4) = 12 mysterious books, 3(2) = 6 non-fiction books and 5(1) = 5 science fiction books.

12 + 6 + 5 = 23.

The school charge for one notebook is 1.45.

To solve this problem, let's use a system of linear equations with the given information.

Let's denote the cost of one pen as P and the cost of one notebook as N. We have the following equations based on Jack's and Ann's purchases:

1) 3P + N = 4.50 (Jack's purchase)

2) P + 3N = 5.50 (Ann's purchase)

We can solve this system of equations using either substitution or elimination method.

In this case,

Let's use the substitution method.

From equation (1),

We can express N in terms of P:

N = 4.50 - 3P

Now, substitute this expression for N in equation (2):

P + 3(4.50 - 3P) = 5.50

Expand and simplify the equation:

P + 13.50 - 9P = 5.50

Combine like terms :

8P = -8

1p+2n=3.50

2p+3n=5.55

Solving these equations: by multiplying 2 in equation (1) and subtracting them,

we get n=1.45

Hence, The school charge for one notebook is 1.45.

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Answer:

$1.50

Step-by-step explanation:

trust me it's correct