The perimeter of a rectangle with a width x and a length that is twice the width

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The formula for perimeter of a rectangle is 2W + 2L

So the question tells us that the width is x and the length is twice the width or 2x.

Plug this into the first equation using W = x and L = 2x

2x + 2*(2x) = 2x + 4x = 6x

So the perimeter is 6x

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