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Rate of Change of Volume of a Cone

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The radius of a right circular cone is increasing at a rate of 2 inches per second and its height is decreasing at a rate of 2 inches per second. At what rate is the volume of the cone changing when the radius is 30 inches and the height is 20 inches?
___ cubic inches per second.

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The rate of change of volume of a cone is found, given the rate of change of height and radius.

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