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A pentagon has a perimeter of 32 inches. Four of its sides are 4, 4, 5, and 7 inches long. What is the length of the 5th side

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Bladerunner1976
The perimeter is the sum of all the sides together so for this problem:
4 + 4 + 5 + 7 + x = 32
20 + x = 32
x = 32 - 20
x = 12 inches