<PRE><B>Question 808314</B>
You have an outdoor pool measuring 25 ft x 10 ft.  You want to add a cement walkway around the pool.  If the walkway will be 1 ft thick and you have 304 cubic feet of cement, how wide should the walkway be?
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Area of the walkway of width w = (25+2w)*(10+2w) - 25*10
Area = 250 + 70w + 4w^2 - 250
= 4w^2 + 70w sq ft
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Vol = Area*depth
304 = 4w^2 + 70w
2w^2 + 35w - 152 = 0
*[invoke solve_quadratic_equation 2,35,-152]
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w =~ 3.6 feet</PRE>