Please help i dont know this The width, w, of a rectangular rug is 4 less than its length, L. If the perimeter of the rug is 120 square feet, which equation could be used to find the dimensions of the rug?

Someone answer this asap for the length, in feet, of a rectangular rug is represented by the expression 5x² + 2x. the width, in feet, is represented by the expression 3x². which expression represents the perimeter, in feet, of the rug? a. 8x² + 2x b. 8x² + 4x c. 16x² + 2x d. 16x² + 4x