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A rock is thrown into a still pond. The circular ripples move outward from the point...

A rock is thrown into a still pond. The circular ripples move outward from the point of impact of the rock so that the radius of the circle formed by a ripple increases at the rate of

44

feet per minute. Find the rate at which the area is changing at the instant the radius is

1515

feet.

Math   Calculus   
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