Picture
24 + x (length)
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| | x (width)
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a) 2(24 + x) + 2x = 188
b) Expand, get all the x's on one side and all the numbers simplifed on the other side
2(24 + x) + 2x = 188
48 + 2x + 2x = 188
- 48 -48
4x = 140
x = 35
c) Because x is the width from the diagram, the width is 35 feet.