Please help it’s a limited test :(

What properties allow transformation to be used as a problem solving tool

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?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.