Write 14,000,000,000 in powers of 10

Can someone me i’m confused. will give brainliest and a whole bunch of points

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?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?