The Two Radii of the Frustum of a Right Circular

question 125

Multiple Choice

The two radii of the frustum of a right circular cone are increasing at a rate of 5 centimeters per minute, and the height is increasing at a rate of 12 centimeters per minute (see figure) . Find the rate at which the volume is changing when the two radii are 18 centimeters and 30 centimeters, and the height is 14 centimeters.

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