Math Questions

Find the cosine of the angle between A and B with respect to the standard inner product on M22 A =[3 3] and B = [4 2] [3 -1] [3 2] Carry out all calculations exactly and round to 4 decimal places the final answer only

Which property is used to compare two linear functions? 1. All of the choices 2. Rate of change 3. Slope

A simple random sample of size n is drawn. The sample mean, x, is found to be 18.1, and the sample standard deviation, s, is found to be 4.7. (a) Construct a 95% confidence interval about p if the sample size, n, is 35. Lower bound:___ Upper bound:______ (b) Construct a 95% confidence interval about p if the sample size, n, is 51.

A deck of cards is randomly dealt by the computer during a game of Spider Solitaire. Find the probability (as a reduced fraction) the first card dealt is (a) A 4 or a heart.

Identify the dependent and independent variable in y = 12x - 30. a)Dependent variable: x and Independent variable: x b)Dependent variable: x and Independent variable: y c)Dependent variable y and Independent variable: x

In order to estimate the population proportion of students at Sandy Beach High that are going to attend prom a random sample of 200 students was taken. The resulting confidence interval was (73%, 80%). Someone in your class believes that 90% of the students will attend prom. Based on the confidence interval constructed, what would you say to your classmate? They are most likely correct because 90% is not in the confidence interval. They are most likely correct because 90% is in the confidence interval. They are most likely incorrect because 90% is not in the confidence interval. They are most likely incorrect because 90% is in the confidence interval.

– 7x – 2y = 37 – 8x + 8y = 40 Is ( – 5, – 1) a solution to the first equation? True False Is (– 5, – 1) a solution to the second equation? True False Is ( – 5, – 1) a solution to the system of equations above? True False

An experimental serum was injected into 500 guinea pigs. Initially, 50 of the guinea pigs had circular cells, 125 had elliptical cells, and 325 had irregular cells. After the serum was injected, all of the guinea pigs with circular cells were affected, 25 with elliptical cells were affected, and none of those with irregular cells were affected. Determine the empirical probability that a guinea pig with (a) circular cells, (b) elliptical cells, and (c) irregular cells will be affected by injection of serum. a) The empirical probability that a guinea pig with circular cells will be affected by injection of the serum is 1. b) The empirical probability that a guinea pig with elliptical cells will be affected by injection of the serum is_____.

Suppose that each circle is equally likely to be selected. One circle is selected at random. Determine the probability indicated. P (- |white circle obtained)

Oreo was asked to find the end behavior of f(x) = 3x² +2 -7x^5+ 11. In which step did she make an error? Explain what her error was. Type your answer below. Step 1: She found the leading coefficient to be 3x^2 Step 2: She found the coefficient to be positive 3, so the function is increasing from left to right Step 3: She found the exponent to be even, so the ends are pointing in the same direction Step 4: Her answer was_______

Solve the equation by factoring: 2w(3w + 1) = 3w + 1. Write your answers as a list of integers or reduced fractions, with your answers separated by (a) comma(s). For example, if you get 4 and -2/3 and as your answers, then enter 4,-2/3 in the box.

Suppose f(c) has zeros at x = -2, c = 4, x = 6 and a y-intercept of 11. In addition, f(x) has the following long-run behavior: as x --> ∓∞, y + ∞. Find the formula for the polynomial f(x) which has the minimum possible degree. f(x) =

Use substitution to solve the system. 3x - 6y = 12 - 3x + y = -4 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.

Find the specified nth term in the expansion of the binomial. (Write the expansion in descending powers of x.) (4x + 5y)^6 ,n=4 a)160,000x^3y^3 b)15x^2y^4 c)240x^2y^4 d)15,625y^6 e)360x^2y^4

A ball is thrown into the air from a tree house and eventually lands on the ground. The equation below shows the distance in feet the ball is from the ground seconds after it is thrown. How high will the ball go? Show your work on paper. d(t) = -t^2 +4t +4

For the function, (a) determine whether it is one-to-one and (b) if it is one-to-one, find a formula for the inverse. f(x) = 2/7x+4 Find the formula for f⁻¹(x), the inverse of f(x) = 2/7x+4 if it exists. Select the correct choice below and, if necessary, fill in any answer boxes within your choice. A. The function is one-to-one and f⁻¹(x) = ▢. (Simplify your answer. Use integers or fractions for any numbers in the expression.) B. The function is not one-to-one and there is no inverse function.

Use the law of sines, the law of cosines, or the Pythagorean Theorem to solve ∆ABC Round to one decimal place where necessary. (A) C = 90°, a = 7, b = 11 (B) A = 32.5°, B = 57.5°, c = 13 (C) A = 39.4°, B = 85.9°C = 54.7 (D) A = 40.3°, B = 49.7°C, c = 13 (E) no triangle is formed.

If121 people attend a concert and tickets for adults cost $53.75 while tickets for children cost $3.5 and total receipts for the concert was $440.25, how many of each went to the concert?

Evaluate f(3). f(x) = -x+3 if x < 2 2x-3 if x ≥ 2 A) f(3) = 0 B) f(3) = 6 C) undefined D) f(3) = 3

A football team sold raffle tickets to raise money for the upcoming season. They sold three different types of tickets: premium for $8, deluxe for $3, and regular for $1. The total number of tickets sold was 155, and the total amount of money from raffle tickets was $409. If 19 more deluxe tickets were sold than premium tickets, how many premium tickets were sold?

Evaluate the sum. 12 ∑ (-5-6i) i=4

Maximize P subject to the given constraints. P= 14y – x constraints x ≤ 7 y ≥ 0 -x + 7y ≤ 6 x +y ≥ 5 a. none of these b. P = 26 at (13/7, 14) c. P = 19 at (7, 13/7) d. P = 70 at (0,5)

10 candies cost 100 cents. Which of the following equations will lead you to find the cost of a candy (x)? O 10^x = 100 O x+10 = 100 O x-10 = 100

Systems of Linear Equations Mini-Lesson Review Which of the following are True about Systems of Linear Equations? Check all that apply. ▢ Two linear equations that relate the same two variables are called a system of equations. ▢ lf a Linear System of Equations has no solution, the two lines are parallel and will never intersect ▢ If a Linear System of Equations have infinitely many solutions, the two lines are parallel and will never intersect ▢ If a Linear System of Equations has one unique solution, the lines intersect at exactly one point. ▢ The solution to a system of equations is always exactly one point. ▢ The SOLUTION to a system of equations is the POINT at which the graphs intersect.

Graph the solution of the system of linear inequalities. 3x-2y ≤ 6 y ≤ -3

A teacher administers a test to his class of 30 students. The mean score (out of 100 possible points) is 80. From previous studies, you know the population standard deviation is 6. Using the sample data given, calculate a 90% confidence interval for the population mean. (A) 75 - 78 (B) 77 - 83 (C) 78 - 82 (D) 75 - 85

Mr. Hanes, the manager of the local movie theatre, found that the more people attended the movies, the larger his daily bank deposit. a): Can Mr. Hanes conclude that larger attendance results in larger bank deposits? b): Explain.

In a study by the Department of Transportation, there were a total of 84 drivers that were pulled over for speeding. Out of those 84 drivers, 34 were men who were ticketed, 15 were men who were not ticketed, 9 were women who were ticketed, and 26 were women who were not ticketed. Suppose one person were chosen at random. Express your answer to each question as a fraction. (a) What is the probability that the selected person is a woman who was not ticketed? Answer: (b) What is the probability that the selected person is a man who was ticketed? Answer:

A water tank that holds 500 gallons and leaks 1/2 gallon of water every hour. (A) What is the rate of change for the function that models the number of gallons in the tank for a given number of hours? (B) Write an equation that represents this function.

Find the general solution of the given second-order differential equation. 25y" – 15y' - 4y = 0

At a high school cafeteria, diners can choose one vegetable from a choice of 5 vegetables, one meat from a choice of 2 meats, one serving of bread from among 2 breads, and a dessert from among 3 desserts. How many meal configurations are possible? a) 20 b)4 c)60 d)12 d)12

Find the first four terms of the arithmetic sequence whose first term is 8 and whose common difference is -3. What is the first term? a₁ = ▢

How many different ways can you rearrange the letters in each of the two words below? ALFALFA ENFEEBLEMENT

Blake is going to invest $34,000 and leave it in an account for 9 years. Assuming the interest is compounded annually, what interest rate, to the nearest tenth of a percent, would be required in order for Blake to end up with $50,000?

Use the inverse of the coefficient matrix to solve the system of equations. x + 4y + 3z = - 26 x - 3y - 2z = 11 2x + 5y + 4z = -11 (x,y,z)= (__,__,__)

You deposit $100 each month into an account earning 8.5% interest compounded monthly. How much total interest will you earn after 30 years? a)$129,070.58 b)$165,070.58 c)$36,000 d)$82,623.82

Daniel is going to invest $860 and leave it in an account for 14 years. Assuming the interest is compounded quarterly, what interest rate, to the nearest hundredth of a percent, would be required in order for Daniel to end up with $1,060?

Solve the equation by factoring: (x + 4)(x + 5) = 11x + 68 x= Write your answers as a list of integers or reduced fractions, with your answers separated by (a) comma(s). For example, if you get 4 and-2/3 as your answers, then enter 4,-2/3 in the box.

A rare isotope of a nuclear material is very unstable, decaying at a rate of 14% each second. Find how much isotope remains 11 seconds after 5 grams of the isotope is created.

Find the probability for the experiment of drawing two marbles (without replacement) from a bag containing 3 green, 5 yellow, and 2 red marbles such that both marbles are yellow. ○ 6/7 ○ 1/3 ○ 2/9 ○ 1/8 ○ 1/4

A box contains three cards. On one card there is a triangle (T), on another card there is a sun (S), and on the third card there is a question mark (Q). Two cards are to be selected at random with replacement. Complete parts (a) through (e) below. a) Determine the number of sample points in the sample space.

For the equation, (a) solve for x in terms of y, and (b) solve for y in terms of x. 6x² - 2xy + 3y² = 8 (a) Solve for x in terms of y. x = y+√(48 - 17y²)/6, y- √(48 - 17y²)/6 (Use a comma to separate answers as needed. Do not factor.) (b) Solve for y in terms of x. y= ▢ (Use a comma to separate answers as needed. Do not factor)

Let X1, X2,..., Xm be independent and identically distributed random variables, each following the Bernoulli(p) distribution, and let X = X_1 + X_2 + ... + X_m. Which one of the following statements is always true? Select one: A. X follows the negative binomial distribution with parameters m and p B. X follows the binomial distribution with parameters m and p C. X follows the geometric distribution with parameter p D. X follows the Bernoulli distribution with parameter p

The polynomial (x + 9)⁷ (x – 5)² (- 3x² + 7x + 2)³ has degree? The leading term will be?

Find the distance between the points (-4, 9) and ( -8,1).

Which formulas can be used to find the surface area of a right prism where p is the perimeter of the base, h is the height of the prism, BA is the area of bases, and LA is the lateral area? Check all that apply. A. SA = BA + ph B. SA = BA+ 1/2 LA C. SA = BA + 1/2 ph D. SA = BA + LA E. SA - BA - LA

Use the given equivalents, along with dimensional analysis, to convert the given unit to the unit indicated. 87 lb to g

In 2001, the mouse population in a park was measured to be 4,860. By 2009, the population was measured again and was found to be 5,980. Assume the population continues to change line (a) Find a formula for the moose population, P, since 2001. (Let t represent the number of years since 2001.) P(t)=_____ (b) What does your model predict the moose population to be in 2023? _______moose

Heights of fourth-graders are normally distributed with a mean of 52 inches and a standard deviation of 3.5 inches. Find the probability that a randomly selected fourth-grader is taller than 60 inches. 2.3% 5% 3% 1.1%

Let f be a twice-differentiable function with derivative given by f'(x) = 4x³ - 24x². (A) Find the x-coordinate of any possible critical points of f. Show your work. (B) Find the x-coordinate of any possible inflection points of f. Show your work. (C) Use the Second Derivative Test to determine any relative extrema and inflection points. Justify your answers. (D) If f has only one critical point on the interval [5, 8], what is true about the function f on the interval [5, 8]? Justify your answers.