The length of a rectangle is three times the width. Which algebraic expression represents the perimeter of the rectangle? A. 3x+x B. 4x C. x+x+x+3x D. X+3x+x+3x

D

Step-by-step explanation:

The perimeter of a rectangle is found using P=2l+2w. For this reactangle, l=3x since its 3 times the width. The width is just x.

Then the perimeter is P = 2*3x+2*x = 6x+2x=8x.

Answer D is the correct choice since x+3x+x+x+3x = 8x.