With these problems to get extra points

Suppose a ball is dropped fromca height of 6ft. it bounces back up but time it bounces, it reaches only 7/10 of its pervious height. what is the total of each height that the ball reaches after 5 bounces

Solve -.016x= -16. need solving this

What are the solutions of the following system? y=-2x^2 y=x-2