Question 1087752
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One line short solution is 


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8x = 5*(x+6)  ====>  8x = 5x + 30  ====>  3x = 30  ====>  x = 10 ft 


is the length of one side of the 8-sided polygon, so the entire perimeter of each polygon is 8*10 = 80 ft.


<U>Answer</U>. The length of each roll of wire fence is 80 ft.
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Solved.