Solve the problem.Suppose that the radius r and the circumference C = 2?r of a circle are differentiable functions of t. Write an equation that relates dC/dt to dr/dt.
A. 
= 
B. 
= 2?
C. 
= 2?
D. 
= 2?r
Answer: C
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Solve the problem.Midtown Antiques has found that sales have decreased 4% from last year. Sales this year are $114,631. Find the amount of last year's sales. Round your answer to the nearest dollar.
A. $119,307 B. $120,407 C. $119,407 D. $119,397
Solve.The roof of a building is in the shape of the hyperbola 
where x and y are in meters. Refer to the figure and determine the height, h, of the outside walls.A = 6 m
A. 2.9 m B. 69 m C. 8.6 m D. 8.3 m
Write the quotient in the standard form.
A. 
+ 
i
B. - 
- 
i
C. 
+ 
i
D. 
+ 
i
Set up the percent proportion, and write "unknown" for the value that is not given. Recall that the percent proportion is 
= 
. Do not try to solve for any unknowns.110% of what is 11?
A. 
= 
B. 
= 
C. 
= 
D. 
= 