Find the mean of these values 100, 200, 300, 400

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums. what is the probability that the applicant who gets the job plays drums or guitar?

Jennifer taking a quiz and has answered 13 questions so far. if there are 25 questions on jennifer test, how many questions does she have left to answer