Question 724034
x = width
4x = length {it is four times as long as it is wide}


Perimeter of a rectangle = 2(width) + 2(length)


2(x) + 2(4x) = 100   {substituted into perimeter formula}
2x + 8x = 100   {multiplied}
10x = 100 {combined like terms}
x = 10  {divided each side by 10}
4x = 40 {substituted 10, in for x, into 4x}


length = 40 m
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