Eight subtracted from the product of 5 and a number is 57

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 does the relationship between the mean and median reveal about the shape of the data

Ineed with number 6 , explain how to get 1978