I need help on Pre-Algebra homework?

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Find the height of a cylinder with a radius of 8.4 inches and a volume of 3546.7 in3. Round to the nearest tenth. I don't understand how to find the height when the problem only has a radius and a volume.

A cone with a diameter of 3 inches has a height of 4 inches. A 2-inch square pyramid is being designed to hold nearly the same amount of ice cream. What will be the height of the square pyramid? Round to the nearest tenth. This problem is really confusing to me! Please help. Thanks!
 
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