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Answer:
7 feet
Explanation:
(3h + 4)² = 24² + h²
9h² + 24h + 16 = 576 + h²
8h² + 24h - 560 = 0
h² + 3h - 70 = 0
(h + 10)(h - 7) = 0
h = 7' (h cannot be -10)
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