Cookies are sold singly or in packages of 12 or 36. with this packaging, how many ways can you buy 72 cookies?

Use set builder notation to represent the following set: { -3, -2, -1, 0}

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?

Precalculus question, image attached.