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The length of a rectangle is four times its width. If the perimeter of the rectangle is 20 feet, how many feet long is the rectangle's length?

Respuesta :

frenchiegirl
largeur = x
longueur = 4 x 

2 ( x + 4 x) = 20
2 x + 8 x = 20 
10 x =20
x = 2

largeur  = 2 et longueur = 8

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