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39. A metal rod in the shape of a cylinder is being heated. The length of the rod is increasing at a rate of .05

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39. A metal rod in the shape of a cylinder is being heated. The length of the rod is increasing at a rate of .05 cm per min. and the diameter is increasing at a rate of .002 cm per min. Find the rate of change in the volume of the rod when it is 20 cm long and the diameter is 2 cm. V =L . xr and d = 2r

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