An object travels along the x-axis such that its position at time t is given by the function x(t) = 7. How many times greater is the instantaneous speed of the object at t = -2/(t+1) than the average speed of the object over the interval 1<t<7?

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