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Assume that the radius r of a sphere is expanding at a rate of 90 cm/min. The volume of a sphere is V = 4ar

Assume that the radius r of a sphere is expanding at a rate of 90 cm/min. The volume of a sphere is V = 4ar and its surface area is 4xr. Determine the rate at which the volume is changing with respect to time when r = 15 cm. (Use symbolic notation and fractions where needed.) dy cm/min dt

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