What calculation will give us the estimated volume of the great pyramid of giza in cubic meters?

The difference between the largest and smallest number of dimes that could be in the bank is 100.

Let's assume the number of nickels in the piggy bank is N, the number of dimes is D, and the number of quarters is Q.

From the given information, we can form two equations based on the number of coins and the total value:

Equation 1: N + D + Q = 100 (total number of coins)

Equation 2: 0.05N + 0.10D + 0.25Q = 8.35 (total value in dollars)

Now, let's determine the range for the number of dimes, D.

To find the smallest number of dimes, we maximize the number of nickels and quarters, which minimizes the number of dimes. Let's assume all remaining coins (100 - D) are nickels:

Equation 1: D + Q = 100 - N

Equation 2: 0.10D + 0.25Q = 8.35 - 0.05N

Since we want to minimize D, let's consider the maximum values for N and Q. Assuming all remaining coins are nickels, we have N = 100 - D - Q.

Plugging in these values, we get:

0.10D + 0.25Q = 8.35 - 0.05(100 - D - Q)

0.10D + 0.25Q = 8.35 - 5 + 0.05D + 0.05Q

0.05D + 0.20Q = 3.35

To simplify, we multiply the equation by 20:

D + 4Q = 67

The largest value for Q would be when D = 0. Therefore, if we assume all remaining coins are quarters, we have:

D = 0

Q = (100 - D) = 100

So, the largest number of quarters is 100, and the largest number of dimes is 0.

To find the largest value for D, we maximize the number of dimes. Assuming all remaining coins are nickels:

N = 100 - D - Q

Plugging this into Equation 2:

0.10D + 0.25Q = 8.35 - 0.05(100 - D - Q)

0.10D + 0.25Q = 8.35 - 5 + 0.05D + 0.05Q

0.05D + 0.20Q = 3.35

Multiplying by 20:

D + 4Q = 67

The smallest value for Q would be when D = 100. Therefore, if we assume all remaining coins are quarters, we have:

D = 100

Q = (100 - D) = 0

So, the smallest number of quarters is 0, and the smallest number of dimes is 100.

The difference between the largest and smallest number of dimes is:

100 (largest) - 0 (smallest) = 100.

Therefore, the difference between the largest and smallest number of dimes that could be in the bank is 100.

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A parallelogram is a quadrilateral with two pairs of parallel sides. Here are the key properties of the sides, angles, and diagonals of a parallelogram:

1. Sides: The opposite sides of a parallelogram are congruent, which means they have the same length. This is due to the parallel nature of the sides.
2. Angles: The opposite angles of a parallelogram are also congruent. Additionally, the consecutive angles (adjacent angles that share a side) are supplementary, meaning they add up to 180 degrees.
3. Diagonals: The diagonals of a parallelogram bisect each other, meaning they divide each other into two equal parts. This property holds true for both the longer and shorter diagonals.
In summary, a parallelogram has congruent opposite sides and angles. The consecutive angles are supplementary, and the diagonals bisect each other. These properties are essential for understanding the fundamental characteristics of parallelograms.

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The bicycle is traveling at a speed of 13 m/s.

In one rotation of the wheel of the bicycle, the distance covered by the bicycle = the circumference of the wheel of the bicycle

Now, according to the question,

Number of rotations of the wheel of the bicycle in 1 minute = 260

∴ Number of rotations of the wheel in 1 second = 260 ÷ 60

                                                                               = 13/3

∴ Distance traveled by bicycle due to the rotation of the wheel in 1 minute = 260 × circumference of the wheel of the bicycle

Or, distance traveled by bicycle in 1 second = 13/3 × circumference of the wheel of the bicycle.

                                                                         = 13/3 × 3 m

                                                                         = 13 m

Hence, the bicycle is traveling at a speed of 13 m/s.

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The complete question is -

How fast is the bicycle traveling if the rear wheel is rotating at a rate of 260 revolutions per minute and the circumference of the wheel is 3 meters.

To approximate the integral ∫₀¹₂ y cos(y) dy using the trapezoidal rule, the midpoint rule, and Simpson's rule with the specified value of n, you need to divide the interval [0, 12] into n subintervals of equal width.

The formulas for each method are as follows:

Trapezoidal Rule:
Approximation = h/2 * [f(x₀) + 2f(x₁) + 2f(x₂) + ... + 2f(xₙ₋₁) + f(xₙ)]
where h = (b - a)/n, x₀ = a, xₙ = b, and f(xᵢ) represents the value of the function at the midpoint of each subinterval.

Midpoint Rule:
Approximation = h * [f(x₀ + h/2) + f(x₁ + h/2) + ... + f(xₙ₋₁ + h/2)]
where h = (b - a)/n and xᵢ represents the left endpoint of each subinterval.

Simpson's Rule:
Approximation = h/3 * [f(x₀) + 4f(x₁) + 2f(x₂) + 4f(x₃) + ... + 4f(xₙ₋₁) + f(xₙ)]
where h = (b - a)/n, x₀ = a, xₙ = b, and f(xᵢ) represents the value of the function at each endpoint and midpoint of each subinterval.

Remember to round your answers to six decimal places.

In conclusion, to approximate the integral 12 ₀ y cos(y) dy using the trapezoidal rule, the midpoint rule, and Simpson's rule, divide the interval [0, 12] into n subintervals of equal width and apply the respective formulas mentioned above.

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The power calculation for the Kolmogorov-Smirnov test, Cramer von Mises test, Anderson-Darling test, and Shapiro-Wilk test applied to an exponential distribution can be done using statistical software or with the use of critical values from tables. The power of a statistical test is defined as the probability of correctly rejecting the null hypothesis when it is indeed false, i.e., detecting a true difference or effect. In this case, we want to calculate the power of each test to detect departures from an exponential distribution. The power calculation of the tests can be done using the following steps:

Step 1: Set up the null and alternative hypotheses: The null hypothesis (H0) is that the data follows an exponential distribution, and the alternative hypothesis (Ha) is that the data does not follow an exponential distribution.

Step 2: Select the significance level and sample size: Choose a significance level α (usually 0.05) and the sample size n.

Step 3: Generate the data: Generate a sample of size n from the exponential distribution.

Step 4: Compute the test statistic: Compute the test statistic for each test using the generated data. For the Kolmogorov-Smirnov and Cramer von Mises tests, the test statistic is the maximum deviation between the empirical distribution function of the data and the cumulative distribution function of the exponential distribution. For the Anderson-Darling test and Shapiro-Wilk test, the test statistic is a weighted sum of squared deviations between the observed values and the expected values under the null hypothesis.

Step 5: Determine the critical value or p-value, Determine the critical value or p-value of each test for the given significance level α and sample size n. This can be done using statistical software or by consulting tables.

Step 6: Calculate the power: Calculate the power of each test using the critical value or p-value from step 5 and the test statistic from step 4. The power is the probability of correctly rejecting the null hypothesis when it is indeed false.

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The solution to the equation p - 21 = 52 is p = 73.

To solve for p, we want to isolate the variable on one side of the equation.

We can do this by performing the same operation on both sides of the equation.

In this case, we add 21 to both sides, resulting in p - 21 + 21 = 52 + 21.

Simplifying further, we have p = 73.

Therefore, the solution to the equation is p = 73.

This means that when p is substituted with 73 in the equation, it satisfies the given equation and makes it true. Solving linear equations involves manipulating the equation using arithmetic operations to isolate the variable.

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To determine the number of ways the ant can move to the bottom left corner of the 4x6 checkerboard in exactly 10 moves, we can approach this problem using combinatorics and counting techniques.

Let's represent the ant's movements as a sequence of "U" (up), "D" (down), "L" (left), and "R" (right) corresponding to the directions the ant can move. Since the ant needs to reach the bottom left corner in exactly 10 moves, the sequence will consist of 10 characters.

Now, let's count the number of valid sequences. To reach the bottom left corner, the ant needs to move down six times and left four times. Therefore, we need to find the number of different arrangements of six "D" and four "L" in the sequence of 10 moves.

This can be calculated using combinations (binomial coefficients). The formula for combinations is:

C(n, k) = n! / (k! * (n - k)!)

In this case, we need to calculate C(10, 4) since we are selecting 4 positions for "L" from a total of 10 positions.

C(10, 4) = 10! / (4! * (10 - 4)!)

        = 10! / (4! * 6!)

        = (10 * 9 * 8 * 7) / (4 * 3 * 2 * 1)

        = 210

Therefore, there are 210 different ways the ant can move to the bottom left corner of the 4x6 checkerboard in exactly 10 moves.

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The given information states that the sum of the measures of angles 6 and 8 is equal to 180 degrees, i.e., m∠6 + m∠8 = 180 so this is a property of a straight angle.

To solve step by step, we start with the given information: m∠6 + m∠8 = 180. This equation indicates that the sum of angles 6 and 8 is equal to a straight angle, which measures 180 degrees.

By the Converse of the Corresponding Angles Postulate, we can conclude that lines 6 and 8 are parallel. This postulate states that if two lines are cut by a transversal, and the corresponding angles are congruent or supplementary, then the lines are parallel.

Therefore, based on the given equation, we can justify that lines 6 and 8 are indeed parallel.

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The given data in the problem is utilized to calculate the weekly rated capacity in standard hours which comes out to be 616.

The given data is as follows:

No. of machines= 7

Operating hours per day= 16

Operating days in a week= 5

Utilization= 80%

Efficiency= 110%

In order to find out the rated weekly capacity, we need to use the below formula:

Rated Weekly Capacity = No. of Machines × Operating hours per day × Operating days per week × Utilization × Efficiency

Now, let's put the values in the above formula.

Rated Weekly Capacity = 7 × 16 × 5 × 80% × 110%

Calculating the above expression, we get,Rated Weekly Capacity = 616

Therefore, the rated weekly capacity is 616 standard hours.

: Rated Weekly Capacity is found out using the formula, Rated Weekly Capacity = No. of Machines × Operating hours per day × Operating days per week × Utilization × Efficiency. The given data in the problem is utilized to calculate the weekly rated capacity in standard hours which comes out to be 616.

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There will be approximately 1,034 defective parts in a batch of 14,490 parts, based on the rate found by the Quality Control Inspector.

To find the number of defective parts in a batch of 14,490 parts, we can set up a proportion using the rate of defective parts found in the sample.

The proportion can be written as:

15 defective parts / 210 parts = x defective parts / 14,490 parts

To solve for x, we cross multiply and then divide:

15 * 14,490 = 210 * x

217,350 = 210 * x

Dividing both sides by 210:

x = 217,350 / 210

Simplifying the right side:

x ≈ 1,034.29

Therefore, there will be approximately 1,034 defective parts in a batch of 14,490 parts, based on the rate found by the Quality Control Inspector.

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Therefore, approximately 95.82% of the variable lies between 10 and 17.

To find the percentage of the variable that lies between 10 and 17, you can multiply the probability by 100. Given that the probability of the variable lying between 10 and 17 is 0.9582, the percentage can be calculated as follows:

Percentage = Probability * 100

Percentage = 0.9582 * 100

Using a calculator, we find:

Percentage ≈ 95.82%

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The probability of the spinner landing on 5 is 1/8.

What is probability?

The probability of an event is a number from 0 to 1 that shows the likelihood of that event happening. If an event is unlikely to happen, its probability is closer to 0. If an event is certain to happen, its probability is closer to 1.A fraction, a decimal, or a percentage can all be used to express probability.

Probability is most commonly expressed as a fraction.Likewise, the probability of the spinner landing on 5 is determined by dividing the number of favorable outcomes by the total number of outcomes.A spinner is divided into 8 equal sections, and each section contains a number from 1 to 8.

What is the probability of the spinner landing on 5?

The total number of outcomes is the same as the number of sections on the spinner, which is 8. The number of favorable outcomes is 1, which is the section with the number 5.

Therefore, the probability of the spinner landing on 5 is 1/8.

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The probability that the mean annual snowfall during 25 randomly picked years will exceed a certain value, we need to calculate the z-score and look it up in the z-table to find the corresponding probability.

To find the probability that the mean annual snowfall during 25 randomly picked years will exceed a certain value, we need to use the properties of the normal distribution. Given that the amount of snowfall is normally distributed with a mean and a standard deviation, we can use the Central Limit Theorem.

The Central Limit Theorem states that if we have a sufficiently large sample size (in this case, 25 years), the distribution of the sample means will be approximately normal regardless of the shape of the population distribution.

To find the probability, we need to convert the mean annual snowfall into a standard score (also known as a z-score) using the formula:

z = (X - μ) / (σ / √(n)), where X is the value we want to find the probability for, μ is the mean, σ is the standard deviation, and n is the sample size.

Once we have the z-score, we can look it up in the z-table to find the corresponding probability. The probability represents the area under the normal distribution curve to the right of the z-score.

In conclusion, to find the probability that the mean annual snowfall during 25 randomly picked years will exceed a certain value, we need to calculate the z-score and look it up in the z-table to find the corresponding probability.

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In order for the experiment to be statistically significant, the research team needs to obtain results that show a significant difference between the new security system and the previous version using the t-test or chi-square test.

The results from the  t-test or chi-square test should provide evidence that the new security system is more effective than the previous version with a high level of confidence.

T o establish statistical significance, the team needs to compare the results to a predetermined significance level, typically denoted as α (alpha).

This significance level is often set at 0.05, meaning that the probability of obtaining the observed results due to chance alone is less than 5%. If the p-value (the probability of obtaining the observed results) is less than the significance level, the team can conclude that the new security system is statistically significantly more effective.

It is important to note that statistical significance does not necessarily imply practical significance or real-world effectiveness. Additionally, the sample size and the power of the statistical test should be taken into consideration when interpreting the results.

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All the students in an algebra class took a 100-point test. Five students scored 100, each student scored at least 60, and the mean score was 76. What is the smallest possible number of students in the class Let the number of students in the class be n. The total marks obtained by all the students = 100n.

The total marks obtained by the five students who scored 100 is 100 x 5 = 500.As per the given condition, each student scored at least 60. Therefore, the minimum possible total marks obtained by n students = 60n.Therefore, 500 + 60n is the minimum possible total marks obtained by n students.

The mean score of all students is 76.Therefore, 76 = (500 + 60n)/n Simplifying the above expression, we get: 76n = 500 + 60n16n = 500n = 31.25 Since the number of students must be a whole number, the smallest possible number of students in the class is 32.Therefore, there are at least 32 students in the class.

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If you buy 5 Number Six burgers and two people are sharing the bill, each person would pay $15.

To calculate the cost of buying 5 Number Six burgers, we need to know the price of one burger.

Let's say each burger costs $6.

To find the total cost, multiply the price of one burger by the number of burgers purchased: $6 x 5 = $30.

So, buying 5 Number Six burgers would cost $30 in total.

Next, you mentioned that two people are sharing the bill.

To determine how much each person pays, divide the total cost by the number of people sharing the bill.

In this case, there are two people.

So, each person would pay $30 / 2 = $15.

Therefore, if you buy 5 Number Six burgers and two people are sharing the bill, each person would pay $15.

Keep in mind that the price of the burgers and the number of people sharing the bill can vary, so always double-check the prices and quantities before making any calculations.

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A system of inequalities can have zero solutions, one solution, or infinitely many solutions, depending on the specific conditions and constraints of the inequalities involved.

A system of inequalities can have different numbers of solutions depending on the specific equations involved. Here are the possibilities:

1. No Solution: It's possible for a system of inequalities to have no solution, meaning there is no set of values that satisfies all the inequalities simultaneously. This happens when the inequalities are contradictory or when their solution sets don't overlap.

2. One Solution: In some cases, a system of inequalities can have a unique solution, where there is only one set of values that satisfies all the inequalities. This happens when the solution set for each inequality overlaps with the others in a specific way.

3. Infinite Solutions: Another possibility is that a system of inequalities can have infinitely many solutions. This occurs when the solution sets for the inequalities overlap completely or when the inequalities are equivalent.

Remember, the number of solutions can vary depending on the specific system of inequalities, so it's important to analyze each case individually.

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The given sequence is 2, 6, 12. To find the common ratio in an explicit formula, we need to determine the relationship between each term in the sequence.

To find the common ratio, we divide each term by the previous term.

Starting with the second term, 6, we divide it by the first term, 2.

[tex]6 / 2 = 3[/tex]

So, the common ratio is 3.

To represent the sequence using an explicit formula, we can use the general form of an explicit formula for geometric sequences, which is:

[tex]a_n = a1 * r^(n-1)[/tex]

Here, "an" represents the nth term in the sequence, "a1" represents the first term, "r" represents the common ratio, and "n" represents the position of the term in the sequence.

Given that the first term (a1) is 2, and the common ratio (r) is 3, the explicit formula for the sequence is:

[tex]a_n = 2 * 3^(n-1)[/tex]

This formula can be used to find the value of any term in the sequence.

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The t-critical value when completing a 95% confidence t-interval with a sample size of 9 is 2.306.

The t-critical value when completing a 95% confidence t-interval with a sample size of 9 can be calculated using a t-distribution table.

The table contains the t-scores and corresponding probabilities for various degrees of freedom and levels of significance.

In this case, the sample size is n = 9, and we want to find the t-critical value for a 95% confidence interval. The degrees of freedom (df) for a sample of size n = 9 is df = n - 1 = 9 - 1 = 8.

To find the t-critical value, we look at the row for df = 8 and column for a 95% confidence level in the t-distribution table.

From the table, the t-critical value is approximately 2.306.

Therefore, the t-critical value when completing a 95% confidence t-interval with a sample size of 9 is 2.306.

We know that the confidence level is 95%, therefore,\[\alpha = 1 - 0.95 = 0.05\]

So,\[t_{\frac{\alpha}{2}} = t_{\frac{0.05}{2}} = t_{0.025}\]

We are given that the sample size is 9.

Therefore, degrees of freedom (df) will be,\[df = n - 1 = 9 - 1 = 8\]

Using the t-distribution table, the t-critical value for a 95% confidence level and df = 8 is 2.306.

Therefore, the t-critical value when completing a 95% confidence t-interval with a sample size of 9 is 2.306.

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To find the exponent of n in the term that contains m³ in the expansion of (2m - 3n)⁹, we need to use the binomial theorem. The exponent of n in the term that contains m³ in the expansion of (2m - 3n)⁹ is 6.

The binomial theorem states that for a binomial expression (a + b)ⁿ, the coefficient of the term containing a^m * b^n is given by the formula:
C(n, m) * a^m * b^(n-m),
where C(n, m) represents the binomial coefficient and is calculated as:
C(n, m) = n! / (m! * (n-m)!).

In this case, the binomial expression is (2m - 3n)⁹ and we are looking for the term that contains m³.

We can find the exponent of n in this term by subtracting the exponent of m from the overall exponent of 9.

Since the term contains m³, the exponent of m in this term is 3.
Therefore, the exponent of n in this term is 9 - 3 = 6.

So, the exponent of n in the term that contains m³ in the expansion of (2m - 3n)⁹ is 6.

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the composite function that can be used to determine the height, in meters, of the flare at any given time is:
h_meters(t) = 0.3048 * h(t)

To determine the height of the flare in meters at any given time, we can use the composite function. The composite function is obtained by converting the height in feet to meters.

The conversion factor to convert feet to meters is 0.3048. So, we can multiply the height in feet by 0.3048 to get the height in meters.

Therefore, the composite function that can be used to determine the height, in meters, of the flare at any given time is:

h_meters(t) = 0.3048 * h(t)  Where h(t) is the height of the flare in feet, and h_meters(t) is the height of the flare in meters.

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Answer:

55 hours

Step-by-step explanation:

We can write an equation:

800=12x+150

And we can solve for x this way:

800=12x+150

subtract 150 from both sides

650=12x

divide both sides by 12

54.1666...=x

So, she will need to work 55 hours to get a new phone.  Unless the job that she works at pays her for half hour shifts, she needs to work 55 hours so she can buy the new phone.  She will have a little extra money left over too.

In the given matrix representing a linear system of equations:

3 -1 5

1 2 -1

The y-coefficient of the first equation can be determined by looking at the coefficient of the y variable, which is the element in the second column of the first row. In this case, the y-coefficient of the first equation is -1.

Therefore, the y-coefficient of the first equation is -1.

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If a published report states that p < .01, the test result is rare, supporting the research hypothesis.

If a published report of an F-test specifies that p < .01, it means that the obtained p-value is less than the significance level of 0.01.

In hypothesis testing, the significance level is typically set at 0.05 or lower, indicating the threshold at which we reject the null hypothesis.

If the obtained p-value is less than the significance level, we reject the null hypothesis and conclude that the results are statistically significant.

In this specific case, since the obtained p-value is less than 0.01, we can conclude that the test result is rare. This rarity indicates that the results are unlikely to occur by chance alone, supporting the research hypothesis. The research hypothesis, which is the alternative hypothesis, proposes a relationship or difference between variables. So, a rare result supports the research hypothesis rather than the null hypothesis, which assumes no relationship or difference between variables.

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The given system is a quadratic-quadratic system, and the solutions are (x, y) = (2, 0) and (x, y) = (-2, 0).

The given system consists of two equations:

Equation 1: 9x² + 4y² = 36

Equation 2: x² - y² = 4

Both equations contain terms with variables raised to the power of 2, which indicates a quadratic equation. Hence, the system is a quadratic-quadratic system.

To solve the system, we can use the method of substitution. Rearrange Equation 2 to solve for x²:

x² = y² + 4

Substitute this expression for x² in Equation 1:

9(y² + 4) + 4y² = 36

9y² + 36 + 4y² = 36

13y² + 36 = 36

13y² = 0

y² = 0

Taking the square root of both sides, we get:

y = 0

Substitute this value of y into Equation 2:

x² - 0² = 4

x² = 4

x = ±2

Therefore, the solutions to the system are (x, y) = (2, 0) and (x, y) = (-2, 0).

Therefore, the system is a quadratic-quadratic system, and the solutions are (x, y) = (2, 0) and (x, y) = (-2, 0).

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Comparing the total areas, we find that the second neighbor's party has more pizza in terms of area, with a total of 324π square inches compared to the first neighbor's party, which has a total of 320π square inches.

To determine which party has more pizza in terms of area, we need to calculate the total area of pizzas ordered by each neighbor.

First, let's calculate the area of a large pizza with a diameter of 16 inches. The formula for the area of a circle is A = πr^2, where A is the area and r is the radius. The radius of a 16-inch diameter pizza is half of the diameter, which is 8 inches.

So, the area of each large pizza is A = π(8 inches) ^2 = 64π square inches.

The first neighbor ordered 5 large pizzas, so the total area of pizzas for their party is 5 * 64π = 320π square inches.

Next, let's calculate the area of a small pizza with a diameter of 12 inches. Using the same formula, the radius of a 12-inch diameter pizza is 6 inches.

Thus, the area of each small pizza is A = π(6 inches)^2 = 36π square inches.

The second neighbor ordered 9 small pizzas, so the total area of pizzas for their party is 9 * 36π = 324π square inches.

Comparing the total areas, we find that the second neighbor's party has more pizza in terms of area, with a total of 324π square inches compared to the first neighbor's party, which has a total of 320π square inches.

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Maria gets 1/12 of the chips.

Lilly has 1/3 of chips. She gives Maria 1/4 of what she has to Maria. To find the fraction that Maria gets, we need to multiply the fraction Lilly gives to Maria (1/4) by the fraction of chips Lilly has (1/3).

Multiplying fractions involves multiplying the numerators and multiplying the denominators. So, multiplying 1/4 and 1/3 gives us (1 * 1) / (4 * 3), which simplifies to 1/12.

Therefore, Maria gets 1/12 of the chips.

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The measure of angle MRN in rhombus MNOP is 90 degrees.

Quadrilateral MNOP is a rhombus, which means it has four sides of equal length. In a rhombus, opposite angles are congruent. To find the measure of angle MRN, we can use this property.

Step 1: Identify the given information. We know that quadrilateral MNOP is a rhombus.

Step 2: Understand the properties of a rhombus. In a rhombus, opposite sides are parallel and opposite angles are congruent.

Step 3: Determine the relationship between angle MRN and other angles in the rhombus. Since angle MRN is an interior angle, it is supplementary to angle NOP (opposite angle in the rhombus).

This means that the sum of angle MRN and angle NOP is equal to 180 degrees.

Step 4: Calculate the measure of angle NOP. Since quadrilateral MNOP is a rhombus, the opposite angles are congruent. Therefore, the measure of angle NOP is also equal to the measure of angle MRN.

Step 5: Use the relationship between angle MRN and angle NOP. We can set up an equation: MRN + NOP = 180 degrees. Since angle NOP is equal to angle MRN, we can rewrite the equation as: MRN + MRN = 180 degrees.

Step 6: Solve the equation. Combine like terms: 2MRN = 180 degrees. Divide both sides of the equation by 2 to isolate MRN: MRN = 90 degrees.

Therefore, the measure of angle MRN in rhombus MNOP is 90 degrees.

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The sum of the arithmetic sequence is -468 (option D).

To find the sum of an arithmetic sequence, we can use the formula:

Sum = (n/2) * (first term + last term)

In this case, the first term of the sequence is 4, and the common difference between consecutive terms is -3. We need to find the last term of the sequence.

To find the last term, we can use the formula for the nth term of an arithmetic sequence:

last term = first term + (n - 1) * common difference

In this case, the last term is -56. We can use this information to find the number of terms (n) in the sequence:

-56 = 4 + (n - 1) * (-3)

-56 = 4 - 3n + 3

-56 - 4 + 3 = -3n

-53 = -3n

n = -53 / -3 = 17.67

Since the number of terms should be a whole number, we round up to the nearest whole number and get n = 18.

Now, we can find the sum of the arithmetic sequence:

Sum = (18/2) * (4 + (-56))

Sum = 9 * (-52)

Sum = -468

Therefore, the sum of the arithmetic sequence is -468 (option D).

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Based on the provided contingency table, the company should consider continuing to offer the defensive driving course. To determine the effectiveness of the course, several factors need to be considered. Firstly, it is important to analyze the proportion of accidents before and after drivers took the course.

If the number of accidents decreases significantly after taking the course, it suggests that the defensive driving course is effective. Additionally, the company should assess the driver's behavior on the road. Are they demonstrating safer driving habits such as maintaining appropriate speed, using turn signals, and keeping a safe distance from other vehicles?

A reduction in traffic violations and improved adherence to road rules among course participants would indicate the course's effectiveness. Moreover, the company can conduct surveys or gather feedback from drivers who completed the course to understand their perception of its usefulness. By considering these factors, the company can make an informed decision on whether to continue offering the defensive driving course. Remember, it's crucial to regularly evaluate and update the course content to ensure its ongoing effectiveness.

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