The perimeter of a square is represented by the expression 80 y minus 16 Which expression represents the length of a side?

A square has four equal sides, so its perimeter is 4 times the length of one side. Divide the perimeter expression, 80y − 16, by 4: (80y − 16) ÷ 4 = 20y − 4. Therefore, the side length is 20y − 4, choice D.

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