9.086 minus 2.419 rounded to the nearest one

Barbara's piano instructors house is 7 1/8 miles from her house. after biking for 1 3/4 miles she stops to rest how much longer does she need to bike to reach her instructor's house

On saturday morning, calls arrive at ticketmaster at a rate of 108 calls per hour. what is the probability of fewer than three calls in a randomly chosen minute?

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.