What is the coefficient of the term 18z in the expression 0.5x +18z?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

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?

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2