A square has a perimeter of 12 x plus 52 units. Which expression represents the side length of the square in units?

A square has four equal sides, so its side length is the perimeter divided by 4. Divide each term in 12x + 52 by 4: (12x + 52) ÷ 4 = 3x + 13. Therefore, the side length is 3x + 13 units, choice A.

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