Solve the problem.A stone is thrown into a pond. A circular ripple is spreading over the pond in such a way that the radius is increasing at the rate of 2.8 feet per second. Find a function, r(t), for the radius in terms of t. Find a function, A(r), for the area of the ripple in terms of r. 
A. (A ? r)(t) = 2.8?t2
B. (A ? r)(t) = 5.6?t2
C. (A ? r)(t) = 7.84?2t
D. (A ? r)(t) = 7.84?t2
Answer: D
Mathematics
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