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A stone dropped into a still pond sends out a circular ripple whose radius increases at...

A stone dropped into a still pond sends out a circular ripple whose radius increases at a constant rate of 2.8 ft/s.

(a) How rapidly is the area enclosed by the ripple increasing when the radius is 2? _____(sq ft/s)

(b) How rapidly is the area enclosed by the ripple increasing at the end of 9.4 seconds? _____(sq ft/s)

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