Use the distributive property to remove the parentheses. 3(6-y)
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This situation is a right triangle with the base measuring 18 and the hypotenuse 22. We are looking for x, the height up the pole that the wire is going to be attached to. We will use Pythagorean's Theorem to find the missing length. 
and 
. x^2 = 160 so x = 
or 12.65 feet