Kenneth S. answered 08/20/17
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
Let x be the length; then the statement says that width = x-4, doesn't it?
Perimeter is 2*width + 2*length; P=2x + 2(x-4).
But also you have been told that perimeter is 72.
From this information, you have the necessary equation, and can solve it, and thus answer the question.