Find the derivative.y = 9x2e-x
A. 9xe-x(x + 2)
B. 18xe-x(1 - x)
C. 9xex(2 - x)
D. 9xe-x(2 - x)
Answer: D
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Design a sine function with the given properties.It has a period of 24 hr with a maximum value of 20 at t = 6 hr and a minimum value of 2 at 
A. 9 sin
+ 11
B. 9 sin
+ 9
C. 9 sin
+ 11
D. 18 sin
+ 11
Solve the problem.A car wheel has a 14-inch radius. Through what angle (to the nearest tenth of a degree) does the wheel turn when the car rolls forward 3 ft?
A. 157.3° B. 152.3° C. 162.3° D. 147.3°
What does the abbreviation stand for?cwt.
A. cost by weight B. count weight C. count D. per hundred weight
Solve the problem.The logarithmic function f(x) = -100 + 87 ln x models the number of visitors (in millions) to a certain country's museums, where x is the number of years since the initial recording of the number of visitors. Use this function to estimate the number of visitors in year 60. Round to the nearest tenth of a year.
A. 128.1 million B. 384.3 million C. 256.2 million D. 192.2 million