PLS HELP (pls pls pls pls pls)

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?

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What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)