Solve the problem. Use 3.14 to approximate the value of ?. Round to nearest tenth unless instructed differently.A semicircular driveway has a diameter of 60 ft. How long is the driveway?
A. 600 ft
B. 92.2 ft
C. 188.4 ft
D. 94.2 ft
Answer: D
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Simplify the following expression.
?
?
A. 1
B. x6y?4
C. 
D. 4
E. 
If x = 4 cot ?, use trigonometric substitution to write 
as a trigonometric function of ?, where 0 < ?< ?.
A. ?4 cos ? B. ?4 csc ? C. ?4 cot ? D. ?4 sec ? E. ?4 sin ?
Provide the proper response.Give an example of a function for which the first derivative is always negative and the second derivative is always positive.
What will be an ideal response?
Solve the problem.If the price charged for a candy bar is p(x) cents, then x thousand candy bars will be sold in a certain city, where p(x) = 113 - 
. How many candy bars must be sold to maximize revenue?
A. 1582 thousand candy bars B. 791 candy bars C. 791 thousand candy bars D. 1582 candy bars