Question: Can someone help me please to understand this, to answer correctly and explain it so that I can understand it. Thank you. This is Calculus

Can someone help me please to understand this, to answer correctly

Can someone help me please to understand this, to answer correctly and explain it so that I can understand it. Thank you.

This is Calculus 1.

and explain it so that I can understand it. Thank you.This is

A stone is dropped into a pond causing ripples (a disturbance) in the form of concentric circles. The area of the disturbed water is changing at a rate of 727 ft per sec . The area of a circle with radius r is A = Tr2. At what rate is the radius of the disturbed water changing when the radius is 4ft. Do NOT write the units in your answer. (The units are ft/sec)

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