Unlike Terms

     Yes x is different from x^ because x doesn't have an exponent.You can combine terms that have the same exponent because they are like terms and u can only combine like terms.1 strategy that you can use to be able to add and subtract integers is to use a number line. Yes 8m-2m is the same as 8m+-2m if you use KFC to solve it.Coefficient are the numbers that go in front of the variable they are important because without them there would be no way to solve an expression.