Question 653314
144 + 108 would give you two sides of the rectangle, but a rectangle has 4 sides!  So:
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144 + 108 = 252 (this is 2 sides)
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144 + 108 = 252 (this is the other two sides)
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Now add them together!
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252 + 252 = 504 inches.
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To not think so much, the formula for the Perimeter of a rectangle is:
P = 2L + 2w
So:
P = 2(144) + 2(108)
P = 288 + 216
P = 504 inches