52 is what percent of 156?

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?

Bring the fraction a/a-4 to a denominator of 16-a^2

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?