Answer:
A
Step-by-step explanation:
1). 5x-3x+7 = 3x-1
2x + 7 = 3x - 1
3x-2x=7+1
x=8
2)
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Width = 4 feet
Let l = length
Let w = width
l = 3w
l - w = 8
3w - w = 8
2w = 8
w = 4