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The volume of wood in a tree varies jointly as the height and the square of the girth. Girth is the distance around. If the volume is 38.

The volume of wood in a tree varies jointly as the height and the square of the girth. Girth is the distance around. If the volume is 38.4 cubic feet, when the height is 30 feet and the girth is 4 feet, what is the height when the volume is 8 cubic feet and the girth is 7 feet?

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