Solve the problem.A circular oil slick spreads so that as its radius changes, its area changes. Both the radius r and the area A change with respect to time. If dr/dt is found to be 2.3 m/hr, find dA/dt when r = 34.5 m. Hint: 
and, using the Chain Rule, 
= 
? 
.
A. 317.4? m2/hr
B. 158.7? m2/hr
C. 79.35? m2/hr
D. 39.675? m2/hr
Answer: B
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Integrate the function f over the given region.f(x, y) = 
over the region bounded by the x-axis, line 
and curve 
A. 9 B. 10 C. 8 D. 1
Solve the problem. Round to the nearest hundredth of a percent if needed.Use of the internet for shopping is increasing dramatically, but still is somewhat age dependent. When a popular web site that sells books asked the age of users who bought products from them over the internet, they obtained the following data. What is the probability that a buyer on this web site is aged 
A. 2.95% B. 4.41% C. 2.86% D. 4.45%
Convert the measurement as indicated.29 pt = 
gal 
qt 
pt
A. 3 gal 3 qt 1 pt B. 6 gal 2 qt 1 pt C. 3 gal 5 pt D. 3 gal 2 qt 1 pt
Find an equation for the line, in the indicated form, with the given properties. Containing the points (5, 0) and (-2, -5); general form
A. 5x + 3y = -5 B. -5x + 7y = -25 C. 5x + 7y = -25 D. -5x - 3y = -5