Answer:
width = 10 cm
length = 37 cm
perimeter = 94 cm
area = 370 cm^2
Explanation:
Perimeter = 2(length + width)
x is width, then length is 3x + 7
so 2(x + 3x + 7) = 94
4x + 7 = 47
4x = 40
x = 10
length = 3(10) + 7 = 37
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