Find the unknown number in the proportion. Write your answer as a whole number or a mixed number if possible.
= 
A. x = 81
B. x = 1
C. x = 9
D. x = 25
Answer: B
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Solve the problem.A surveyor is standing 35 ft from the base of a building. She measures the angle of elevation to the top of the building to be 65°. How accurately must the angle be measured for the percentage error in estimating the height of the building to be less than 5%?
A. To within -0.005° B. To within -0.47° C. To within -0.02% D. To within -0.02°
Solve for the indicated variable.P = 30,000 ? et/3, for t
A. t = 30 ? ln P
B. t = ln (30 P)
C. t = 3 ? ln 
D. t = 3 ? ln 
Find the derivative.
A. 16x9/2
B. 8x4
C. 
x6 - 
D. 
x6
Find the length of the missing side of the right triangle. Round to three decimal places, if necessary. The legs of the right triangle are represented by a and b, and the hypotenuse is represented by c.a = 16, c = 20
A. b = 12 B. b = 11.576 C. b = 25.612 D. b = 384