How long a ladder must you have to reach the top of a 15 -foot wall if the bottom of the ladder is placed 4 feet from the base of the wall? Round to the nearest tenth of a foot.

The wall, ground, and ladder form a right triangle, with legs of 15 feet and 4 feet. By the Pythagorean theorem, the ladder’s length is √(15² + 4²) = √241 ≈ 15.5 feet, so the correct choice is 15 point 5 ft.

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