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 2.9 m/hr, find dA/dt when r = 27.9 m. Hint: 
and, using the Chain Rule, 
= 
? 
.
A. 40.455? m2/hr
B. 323.64? m2/hr
C. 80.91? m2/hr
D. 161.82? m2/hr
Answer: D
Mathematics
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What will be an ideal response?
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- 
A. 
B. 
C. 
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