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A paper cup, which is in the shape of a right circular cone, is 16 cm deep and has a radius of 4 cm. Water

A paper cup, which is in the shape of a right circular cone, is 16 cm deep and has a radius of 4 cm. Water is poured into the cup at the constant rate of 2 cm3/sec.

a) At the instant the depth is 5 cm, what is the rate of change of the height?

b) At the instant the radius is 3 cm, what is the rate of change of the radius?

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