ball is dropped from 10 feet off a surface with a coefficient of restitution of 0.9, how many bounces before it rises to less than 1 foot.

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15