Marisol has 486 square inches of wrapping paper to cover a gift box. What is the side length of the largest size box she can use to wrap a gift?

For a cube with side length s, the six square faces have a total area of 6s². Set 6s² = 486, so s² = 81 and s = 9 inches. The largest box is therefore 9 inches on each side, choice A.

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