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

 

 

Perimeter=

Guest May 7, 2017
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If the width is x, the length is twice this  = 2x

 

And

 

Perimeter = 2 (W + L)      so

 

Perimeter =  2 ( x + 2x)

 

Perimeter  = 2 (3x)

 

Perimeter  = 6x

 

42  =  2 ( x + 2x )

 

42  = 2 ( 3x)  

 

42  =  6x

 

 

 

cool cool cool

CPhill  May 7, 2017

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