Find all solutions of the equation in the interval [0°, 360°).2 cos2 ? - 3 cos ? + 1 = 0
A. {0°, 60°, 300°}
B. {0°, 30°, 330°}
C. {60°, 90°, 300°}
D. {0°, 60°, 120°}
Answer: A
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Solve the problem.A company adopts an advertising campaign to weekly add to its customer base. It assumes that as an average fifty percent of its new customers, those added the previous week, will bring in one friend, but those who have been customers longer will not be very effective as recruiters and can be discounted. A media campaign brings in 10,000 customers initially. What is the expected total number of customers with whom the company can expect to have dealings?
A. 30,000 customers B. The sum diverges to infinity. C. 15,000 customers D. 20,000 customers
Solve the problem.Write 
+ 
as a single iterated integral.
A. 
B. 
C. 
D. 
Solve the system of equations by Gaussian elimination. If there is an unlimited number of solutions, find two of them.x - z = 2y + z = 2x + z = 4
A. x = 3, y = 1, z = 1 B. x = 6, y = 2, z = 2 C. x = 1, y = 3, z = - 1 D. x = 2, y = 2, z = 0
You are given the future value of an annuity, A, the monthly payment, R, and the annual interest rate, r. Find the number of monthly payments, n. Round your answer to the nearest whole number if necessary.A = $3500; R = $70; r = 7%
A. 44 months B. 49 months C. 47 months D. 48 months