Which rational number is not greater than point a

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?

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

52 cm radius = diameter = area = circumference = circumfer