Explanation:
Perimeter = l + l + w + w = 20
2 l + 2w = 20
l + w = 10 ======> l = 10-w
Area = l * w = 24 sub in the definition of l (above)
24 = (10-w) * w
-w^2 + 10w - 24 = 0 Use quadratic formula (or factoring)
to find l and w = 4 and 6 ft
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