A ballon is in the shape of an inverted ...

A ballon is in the shape of an inverted cone surmounted by a hemisphere. The height of the cone is equal to the diameter of the sphere. If h is the total of the ballon, how does the volume of the ballon changes with h? What is the rate in volume when h=9 units?

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The correct Answer is:

`12 h (dh)/(dt)`

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