Question: The radius rof a circle is increasing at a rate of2 inches per minute. Find the rate of change of the area whenExercise (a)r=8 inches.Step

The radius rof a circle is increasing at a rate of2 inches per minute. Find the rate of change of the area whenExercise (a)r=8 inches.Step 1dr=2.SKIP (YOU CANNOT COME BACK)Exercise (b)r=21 inches.Step 1From part (a),we have that the rate of change of area with respect to time isdAdt=4r.To find the rate of change when r=21 inches, substitute 21 for r into dAdt, then simplify.dAdt,=4r,=4,,=,in2min

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