Math Questions

An auditorium has 20 rows of seats. There are n = 24 seats in the first row, 25 seats in the second row, 26 seats in the third row, and so on (see figure). How many seats are there in all 20 rows? ______________ seats

Solve by the elimination method. 4x - y = 1 x + 3y = 10 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The solution is (Simplify your answer. Type an ordered pair.) B. There are infinitely many solutions. C. There is no solution.

An artist creates a right prism whose bases are regular decagons. He wants to paint the surface of the prism. One can of paint can cover 32 square feet. How many cans of paint must he buy if the height of the prism is 11 ft and the length of each side of the decagon is 2.4 ft? Make sure to round to the nearest whole can.

The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 26.6 for a sample of size 628 and standard deviation 10.3. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 90% confidence level). Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).

Consider the series Σ1/n (a) Does the sequence {an} = 1/n converge or diverge? (b) Does this series converge or diverge? (c) How many terms are required for the sum to exceed 50? Show work used to find this value.

The price-earnings (PE) ratios of a sample of stocks have a mean value of 10.5 and a standard deviation of 1.1. Assume the PE ratios have a bell shaped distribution. According to the Empirical Rule, what percentage of PE ratios that fall between, A 9.4 and 11.6 B 8.3 and 12.7 C 7.2 and 13.8

300 people are lined up outside of Disneyland, and all enter by 8:15 am. By 8:30 am, 550 more people enter, and every 15 minutes afterwards, the number of people who enter increases by 250. All of these people are planning to stay for the Marvel parade at noon. a. Represent this problem as a sequence and write a formula for the nth term. b. How many people will enter the park between 11:45 and noon?

Solve the rational equation. If the equation has no solution, so state. 32/(x² - 25) + 8/(x + 5) = 4/(x - 5) (A) The solution set is { } (B) There are infinitely many solutions. (C) There is no solution.

Find the indicated conditional probability using the following two-way table: Grade Drive to school Take the bus Walk Sophomore 2 25 3 Junior 13 20 2 Senior 25 5 5 P( Walk to school | Senior) = [?] Round to the nearest hundredth.

The Malones' electric bills for January through June, 2006, were $95.37, $106.51, $87.73, $83.07, $76.57, and $68.28. For these bills, determine the (a) mean and (b) median a) The mean is $______. (Round to the nearest cent as needed.)

Suppose a game has payoff matrix [0 -4 2] [3 2 -4] [1 -1 0] Find the expected value of the game for the following strategies for players A and B. (a) A=[ 0.1 0.4 0.5]; B = [0.2] (b) A = [ 0.3 0.4 0.3 ]; B =[0.8] [0.4] [0.1] [0.4] [0.1] (a) The expected value is -0.26 .(Round to two decimal places as needed.) (b) The expected value is ▢ (Round to two decimal places as needed.)

Find a1 and d for the following arithmetic series. S12 = 300, a12 = 47 a1 = ____.

Graph the linear equation. f(x) = -(1/3)x. Use the graphing tool to graph the equation.

The demand equation for a certain product is 8p² +5q² = 1400, where p is the price per unit in dollars and q is the number of units demanded. (a) Find and interpret dq/dp. (b) Find and interpret dp/dq. (b) How is ap/dq calculated? A. Use implicit differentiation. Differentiate with respect to q and assume that p is a function of q. B. Use implicit differentiation. Differentiate with respect to q and assume that q is a function of p. C. Use implicit differentiation. Differentiate with respect to p and assume that p is a function of q. D. Use implicit differentiation. Differentiate with respect to p and assume that q is a function of p. Find and interpret dq/dp, Select the correct choice below and fill in the answer box to complete your choice.

Minimize P subject to the given constraints. P= 9x + y constraints x ≥ 0 y ≥ 0 -x + 3y ≤ 8 -3x + y ≥ -3 a. P=0 at (0, 0) b. P=9 at (1, 0) c. P=-3 at (0, -3) d. none of these

The height of a cylinder is three times the diameter of the base. The surface area of the cylinder is 126π ft^2? What is the radius of the base?

It is known that 259 of the 876 birds that nest in a certain park prefer worms. You believe that the proportion of brown birds that nest in a certain park and prefer worms is lower when compared to all birds that nest in the park, and decide to test your hypothesis with a 0.01 level of significance. You sample 97 brown birds that nest in the park and discover that 17 prefer worms. Perform the z-test and interpret your results. Alpha (a) Zₐ zₐ/₂ 0.1 1.28 1.645 0.05 1.645 1.96 0.01 2.33 2.575 The z-score is 2.592. You would reject the null hypothesis. The z-score is 2.592. You would not reject the null hypothesis. The z-score is -2.592. You would reject the null hypothesis. The z-score is -2.592. You would not reject the null hypothesis.

Suppose the binomial expansion of (x - y)n includes the term – 84x6y3 The x5y4 term in the expansion will be ___ The x6y8 term in the expansion will be ___

Using the information below to create the initial simplex matrix. Assume all variables are nonnegative. Maximize f = 6x₁ +5x₂ + 7x₃ subject to 9x₁ + 7x₂ + 10x₃ ≤ 65 10x₁ + 3x₂ + 6x₃ ≤ 50 4x₁ + 10x₂ + 6x₃ ≤ 45 x₁ ≥0 x₂ ≥ 0 x₃ ≥ 0

Ms. Bell's mathematics class consists of 13 sophomores, 6 juniors, and 11 seniors. How many different ways can Ms. Bell create a 5-member committee of seniors if each senior has an equal chance of being selected?

Graph the inequality. 3x + y<5 Use the graphing tool to graph the inequality.

Suppose the binomial expansion of (x + y)^n includes the term 3003x⁶y⁸. The x⁵y⁹ term in the expansion will be? The x⁴y³ term in the expansion will be?

Simplify the expression without using a calculator. log₄ 4¹¹.

You intend to estimate a population mean μ with the following sample. 35.6 53.7 48.1 42.9 7.5 5.6 11.6 You believe the population is normally distributed. Find the 99% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to two decimal places (because the sample data are reported accurate to one decimal place). 99% C.I. =(______,_______). Answer should be obtained without any preliminary rounding.

Solve the compound inequality. - 2x < -8 and x-4 <5 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The solution set of the compound inequality is ___ . (Type your answer in interval notation.) B. The solution set is Ø.

A local restaurant manager wants to survey customers about the service they receive. Each night the manager randomly chooses a number between 1 and 10. He then gives a survey to that customer, and to every 10th customer after them to fill it out before they love. Cluster Sample Systematic Sample Simple Random Sample Convenience Sample

Use Gauss-Jordan elimination to find the solution to the following system of equations. 9x + 20y + 4z = 11 4x + 9y + 3z = -3 X+ 2y – 2z = 5 Select the correct choice below and fill in any answer boxes within your choice. A) There is one solution. The solution is x= ______, y= _____and z= ______. (Simplify your answer.) B) There are infinitely many solutions. If z is any real number, x= _____ and y= _______. (Type an expression using z as the variable.) C) There is no solution.

A company uses two vans to transport workers from a free parking lot to the workplace between 7:00 and 9:00 a.m. One van has 5 more seats than the other. The smaller van makes two trips every morning while the larger one makes only one trip. The two vans can transport 65 people, maximum. Let x be the seats in the small van and y the seats in the large van. How many seats does the larger van have?

Graph the linear equation. f(x)=(1/2)x +1

Pythagoras and Esky both put $400 into a bank at the same time. Pythagoras's bank calculates 5% interest compounded annually. Esky's bank compounds continuously using 4.5% interested. Who will have more after 10 years and by how much? Pythagoras will have $24.24 more Esky will have $24.24 more Pythagoras will have $21.24 more Esky will have $36.15 more

In a survey of families, the following data were obtained relating to the number of pets in their household: Number of pets Frequency 0 10 1 15 2 10 3 10 4 5 total 50 What is the probability of calling a random family from the list that has less than 3 pets? What is the probability of calling a random family from the list that has less than 3 pets?

Consider the function f(x) = 3x^5/3 + 60x^2/3. (a) Show that f'(x) = {[5(x + 8)] / ∛x}. Then find and classify all local extrema of f. b) Find the values of the global extrema of f on the domain [-1,1]. c) Justify briefly, but precisely, why f has global extrema on the interval [-1, 1]

Solve the compound inequality. -2x≤-8 or 7x-21≥21 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A). The solution set is _____. B). The solution set is Ø.

For the arithmetic sequence, find a18 and an when a1 = 7 and d = -5. a18 = -78. an = ____.

Consider the quadratic equation y = x² + 2x + 9. Complete the square to express the quadratic in standard form y = a(x – h)²+k a =_______ h =_______ k =_______

For the given functions f and g, find the requested function and state its domain. f(x) = 9x - 2; g(x) = 7x - 8. Find f-g. (f - g)(x) = 2x + 6; all real numbers (f - g)(x) = 2x - 10; {x|x ≠ 5} (f - g)(x) = -2x - 6; all real numbers (f - g)(x) = 16x - 10; {x|x ≠ 1}

Oliver wants to have $13,000 in 15 years after investing in an account that earns 4.2% compounded quarterly. How much should he invest?

Evaluate the sum. 10 ∑(j + 4). j=1 10 ∑(j + 4) = _______ j=1

Write an algebraic expression to represent each of the scenarios below. Your answers must be simplified completely. Scenario Algebraic Expression a)Sales tax is currently 9.1 %. Write an algebraic expression to represent the total amount paid for an item that costs D dollars after tax is added to the purchase. b)A store is having a 45% off sale. Write an algebraic expression to represent the sale price for an item that is originally priced at D dollars. c)Carmen receives a 3% raise every year. Write an algebraic expression to represent Carmen's salary after one year if her current salary is S dollars. d)Let B represent the bill for dinner at your favorite restaurant. You decide to leave a 18% tip. Write an algebraic expression to represent the total amount paid for dinner, including tip.

• Suppose a brand of cereal claims that each box contains 7% marshmallows and 93% flakes. • You believe that there are fewer than 7% marshmallows in each box. • In a certain box, you randomly selected 600 pieces of cereal. • Out of the 600 pieces of cereal, 29 pieces were marshmallows. Assuming all conditions are met to perform a significance test, answer the following. A State the null and hypothesis. B State the p-value. C Make a conclusion to reject or fail to reject the null at a 5% significance level.

Fill in the blank with the appropriate word. A group that also satisfies the commutative property is called a(n)___________ (or abelian) group. A group that also satisfies the commutative property is called a(n) __________ (or abelian) group. → finite → commutative → associative → infinite

Three computers are chosen at random from an inventory of Dell and Acer computers for a bookstore display. Assume the same number each brand of computers is in stock. Find the probability that (a) All three will be Dells. (b) Exactly two will be Acers. (c) At least two will be Acers.

Chris operates a small sign-making business. He finds that if he charges x dollars for each sign, he sells 40 - x signs per week. What is the smallest number of signs that he can sell to have an income of $256 in one week?

Inside a bag there are 3 green balls, 2 red balls and 2 yellow balls. Two balls are randomly drawn without replacement. Calculate the probability of drawing one green ball and one yellow ball. The tree diagram has been started. ▢

Find the probability for the experiment of selecting one card from a standard deck of 52 playing cards such that the card is a 10 or higher (aces are low). 4/13 11/13 9/26 12/13 3/13

Write an equation for the hyperbola with center at (5, – 4), focus at (8, – 4), and vertex at (7, - 4). An equation for the hyperbola is ____ .

For each function below, identify the Slope, horizontal-intercept and vertical-intercept Write your numerical answers as whole numbers or reduced fractions. Write your intercepts as ordered pairs. If a slope or intercept Does Not Exist, write DNE Function Slope Vertical Intercept Horizontal Intercept y = 4x + 3 y = -8x + 7x y = 10x y = 2 x= -6

Isaac invested $1,800 in an account paying an interest rate of 4.7% compounded continuously. Assuming no deposits or withdrawals are made, how much money, to the nearest hundred dollars, would be in the account after 15 years?

You are interested in estimating the mean weight of the local adult population of female white-tailed deer (doe). From past data, you estimate that the standard deviation of all adult female white-tailed deer in this region to be 17 pounds. What sample size would you need to in order to estimate the mean weight of all female white-tailed deer, with a 95% confidence level, to within 5 pounds of the actual weight? Sample Size: n≥

Consider a two sector economy with input-output matrix A= [0.4 0.5] [0.2 0.6] (a) Are the sectors in the economy profitable? Give a reason for your answer. (b) Is the economy productive? Give a reason for your answer.