Today each cookie coat $0.75 less than the normal price. right now if you buy 7 of them it will cost you $2.80. write an equation to determine the normal price of each cookie.

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?