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Which formula gives the area of a triangle? a=1/2(b+h)

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?

Fast! find the length of cu. the triangles are similar. show your work.