What is the awnser to this problem- 4972+34728+3-584=

What is the sum of these mixed numbers 2 1/8 + 4 3/8

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?

Find the area of the regular hexagon if a side is 20 cm.