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Please help me

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?

Change negative exponents to positive. then solve. round to four decimal places

Find the amount of simple interest earned for depositing the given principle in an account if $2200 is invested at 5.5 % for 6 months