your GPA is the average of all your grades it's if you have an A its 4.0 if you have a B its 3.0 and if its a C is 2.0 so if you have slightly more B's than A's it would be about a 3.15 you could also have mostly A's and one C. hope that helps
algebraic expressions use variables, in problems you can pick one thing and call it X and another thing and call it Y. whatever those two things you picked can equal some unknown thing.
