Which ordered pair is a solution of the equation y = 3x?

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

Plzzz answer both questions and i will give you 100 points

Solve 4 ln x=2ln25 a) x=5 b) x=25 c) x=625