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Pat needs to determine the height of a tree before cutting it down to be sure that it will not fall on a nearby fence.

Pat needs to determine the height of a tree before cutting it down to be sure that it will not fall on a nearby fence. The angle of elevation of the tree from one position on a flat path from the tree is H=40, and from a second position L=60feet farther along this path it is B=30. What is the height of the tree?

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