Which pairs of radicals is a pair of the like radicals? 3/5 3/5 and 3/7 4/2 and 5/2 5/6 and 6/5 9/2 and -9/3

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