Question 895854
Think of a perimeter as a fence.  It requires 2 lengths and 2 widths to enclose.
P = 2L + 2W
You're given the value of P as 72
72 = 2L + 2W
You're given the value of W
72 = 2L + 2(14)
72 = 2L + 28
Subtract 28 from each side
44 = 2L
Divide each side by 2
L = 22
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W = 14
L = 22
22 + 22 + 14 + 14 = 72