The length of a rectangle is twice its width and its perimeter is 42 cm. f the width of the rectangle is x cm, write an expression for the perimeter of the rectangle in terms of x.

Guest May 6, 2017

width = x

length = 2x

perimeter = 2*(2x+x) → 6x


6x = 42


x = 42/6 → 7 cm


Alan  May 6, 2017

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