Please help me with this question

What term makes it inconsistent y=2x - 4

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

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?