Question 99520
Ahh. This is a simple application of the Pythagorean Theorem! Think of the rope that Anne is pulling on as the hypotenuse since she is standing away from the tree and the rope is attached to the top of the tree and the problem said that the rope is longer than the tree's height. Then, think of the height of the tree as a side of a right triangle. 

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48|__\_60
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____x

Let's call x the distance that Anne is from the tree. The theorem is
{{{a^2 + b^2 = c^2}}} so in our case {{{a = 48}}} and {{{c = 60}}}.
So {{{a^2 = 2304}}} & {{{c^2 = 3600}}}.
Then {{{2304 + x^2 = 3600}}}
{{{x^2 = 3600 - 2304}}} so {{{x^2 = 1296}}}
Then {{{x = 36}}} so Anne is standing 36ft from the tree.
Also, if you notice, 48 and 60 are multiples of 12. If you divide them by 12 you get 4 and 5. That follows special triangles with sides called Pythagorean Triples. One of them is 3,4,5. So if you can notice a right triangle as having two of those sides, you can immediately know what the third side is. But, remember always show your work to get full credit in class  ;-)