A rectangle has a length of 10 inches and a width of 4 inches whose sides are changing. The length is decreasing by 2 in/sec and the width is shrinking at 7 in/sec. What is the rate of change of the area?

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Q: What is the rate of change of the area?

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A: drdt=0.05cm/minradius, r=52cmArea=πr2Derivative formuladdxxn=n xn-1

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