Arthur D. answered 04/05/16
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n^2=45^2+24^2
n^2=2025+576
n^2=2601
√n^2=√2601
n=51 feet is the height of the tree
also,...
45/3=15
24/3=8
n^2=15^2+8^2
n^2=225+64
n^2=289
√n^2=√289
n=17
17*3=51 feet (just smaller numbers to work with)