An 8-packed of erasers costs $3.68. What is the cost per eraser?

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

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?

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30