Determine the indefinite integral.
A. cosh-1 9x + C
B. - 
cosh 9x + C
C. 
cosh 9x + C
D. cosh 9x + C
Answer: C
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Solve the problem.The intensity I of light varies inversely as the square of the distance D from the source. If the intensity of illumination on a screen 5 ft from a light is 2 foot candles, find the intensity on a screen 15 ft from the light.
A. 
foot-candle
B. 
foot-candle
C. 1
foot-candles
D. 2 foot-candles
Solve.A manufacturer determines that the profit in dollars for manufacturing n units is 
(Assume that n is a positive integer) How many units are produced when the profit is $405?
A. 5 units B. 50 units C. 40 units D. 45 units
Solve.A stock broker is paid 
per month plus 
of the total sales of stocks that she sells. Last month Cora sold $228,000 worth of stock. What was her total income for the month?
A. $114,550 B. $11,950 C. $11,400 D. $114,000
Solve the problem.To get an A in biology, Fred must have a mean score of 91 on six quizzes. Scores on the first five quizzes were 93, 85, 87, 93, and 96. What is the lowest score that Fred can get on the last quiz and still receive an A?
A. 102 B. 90 C. 92 D. 91