16.25 divided by 0.14 plz show work and answer fast

How do you answer this question? (step by step)

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?

Sketch one cycle if the cosine function y=2cos2theta