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Assume that the radius r of a sphere is expanding at a rate of 20 crn/min. The volume of a sphere is V = $113

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Assume that the radius r of a sphere is expanding at a rate of 20 crn/min. The volume of a sphere is V = $113 and its surface area is 47rr2 . Determine the rate at which the surface area is changing with respect to time when r = 40 cm. (Use symbolic notation and fractions where needed.)

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