cos W 8/113 .... 12. Mariela is standing in a building and looking out of a window at a tree. The tree is 20 feet away from Mariela. Mariela's line of sight to the top of the tree creates a 42° angle of elevation, and her line of sight to the base of the tree creates a 31° angle of depression. 42° 20 ft- 31° What is the height, in feet, of the tree?

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