Write a verbal expression for (a-3)^2

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?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

Simplify this expression. 8x 16(x + y)