A new vending machine costs $4,500.00 and it is on sale for 10%. What is the price of the vending machine after the discount is applied?

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

Math it's appreciated. (picture provided)

Aiko jumped rope for 20 min and stopped at 8: 05 when did she start