Solve the problem.Suppose a cost-benefit model is given by 
where C is the cost in thousands of dollars for removing p percent of a given pollutant. Find C(90) to the nearest dollar and interpret it.
A. $5800; It will cost $5800 to remove 0.90% of the pollutant.
B. $5220; It will cost $5220 to remove 0.90% of the pollutant.
C. $52,200; It will cost $52,200 to remove 90% of the pollutant.
D. $9000; It will cost $9000 to remove 90% of the pollutant.
Answer: C
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Solve the problem. Round results to an appropriate number of significant digits.From a balloon 1028 ft high, the angle of depression to the ranger headquarters is 45.9°. How far is the headquarters from a point on the ground directly below the balloon?
A. 996 ft B. 991 ft C. 1001 ft D. 986 ft
Establish the identity.
= 1 + sin ? cos ?
What will be an ideal response?
Write a mathematical expression for the word phrase.60% of 57
A. 
B. 0.60(0.57)
C. 0.60(57)
D. 60(0.57)
Find the sum of the first five terms of the sequence with the given general term. ? 4k ?
A. 20 B. 60 C. 24 D. 66 E. 130