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OpenStudy (anonymous):
The dimensions of Eric’s pool are 9 feet by 7 feet. He wants to build a walkway surrounding the pool so that the square footage of the walkway and pool is 143 square feet. How wide is one side of the walkway?
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OpenStudy (a_clan):
Area of walkway = 143 - 63 = 80 sq ft So, 2[(9+2x)*x] + 2[7*x] = 80
OpenStudy (a_clan):
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