Eight friends want to play enough games of chess to be sure everyone plays everyone else. How many games will they have to play?

Carter drank 15.75 gallons of water in 4 weeks. he drank the same amount of water each day.a. estimate how many gallons he drank in one day.b. estimate how many gallons he drank in one week.c. about how many days altogether will it take him to drink 20 gallons?

Math each whole number with a rational,exponential expression

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct