-1 = (x-1)/3
(multiply both sides by 3)
-3 = x-1
(add 1 on both sides)
x=-2
Answer:


Step-by-step explanation:
Perimeter of the trapezoid-shaped window = sum of all the sides of the window frame
Thus, the equation to find the unknown side length, x, would be:
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Solve for x

Subtract 14.89 from each side

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Is it a right triangle?? If so use the Pythagorean theorem (a2+b2=c2)