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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

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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.

image text in transcribed
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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