A college student takes the same number of credits each semester. She had 8 credits when she started, and after 7 semesters, she had 78 credits. Which of these expresses the rate at which she is earning credits?

A girl has been getting her parents change every day for a year. She has dimes and half-dollars worth $50.00. If she has five times as many dimes as half-dollars, how many of each type of coin does she have?

An airplane travels 3600 miles from city A to city B. On the way back, the airplane speed was 50% more than its outbound speed. If the total time for the trip was 10 hours what was the outbound speed?

A rainstorm increased the amount of water stored in State J reservoirs from 124 billion gallons to 138 billion gallons. If the storm increased the amount of water in the reservoirs to 82 percent of total capacity, approximately how many billion gallons of water were the reservoirs short of total capacity prior to the storm?

Joni planted two tree saplings in their garden on the same day. One tree sapling started out 25 inches tall and grew at a rate of 1.5 inches per week. Another tree sapling started out 35 inches tall and grew at a rate of 1 inches per week. After how many weeks were the two tree saplings the same height? weeks How tall were the saplings at this time? inches

A total of $6000 is invested for 5 yr with a total return of $1080. Part of the money is invested in a fund that returns the equivalent of 2% simple interest. The rest of the money is invested at 4% simple interest. Determine the amount invested in each account.

Krishna is 27 years older than Jane. In 5 years Krishna will be 2 times Jane age. How old is each now? Krishna is Jane is years old. years old.