Consider x^4+8xy^2=-135 find dy/dt when x=3, y=-3 and dx/dt=2

Abouncy ball is released from a certain height. on the first bounce, it travels 32cm. with each subsequent bounce, it travels 9/10 the distance of the previous bounce. what is the total distance that the ball has traveled when it completes its 25th bounce?

Askate shop rents roller skates as shown on the table below. which graph and function models this situation?

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14