The change in kinetic energy (in joules) as a horse accelerates from canter to gallop is found using the expression 1/2×350×(12^2-6^2). which is the change in kinetic energy?
(i put ^ for square, like 12 squared by 2.)

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