Answer choices - a: x = -9 b: x = 2 c: x = -4/3 d: x = 67
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If this is an equilateral triangle, we need half of it to find the height which is a leg of a right triangle with a hypotenuse of 15. That means that the base of this half triangle is 7.5. Use Pythagorean's Theorem to fine the height. 
. x = 12.99 or 13