5. Janice is 12 years more than 2/5 of Donna's age. Janice is 37 years old. Write an algebraic equation to find Donna's age.

Adice is rolled 5 times. how many possible rolls are there? ( determine the number of outcomes using only the fundamental counting principal )

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In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?