Arturo is building a flower bed in the shape of a right triangle. The hypotenuse of the right triangle is 13 feet. One of the legs needs to be 7 feet longer than the other leg.

Let the shorter leg be x feet, so the longer leg is x + 7 feet. By the Pythagorean theorem, the sum of the squares of the legs equals the square of the hypotenuse: x² + (x + 7)² = 13² = 169. This matches choice D.

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