One third of the sum of 15 and thrice a certain number is
equal to twice the number. Find
the number

Find a number such that if you add 8 and divide the result by 4 you will get the same answer as if you subtracted 3 from the original number and divided by 2

Find the domain of the following expression: 1/(√x)-2

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out