Martin has an empty bag and puts in 3 red marbles. he now wants to put in enough green marbles so the probability of drawing a red marble at random from the bags is 1⁄4. how many green marbles should he put in?

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