"Unlike Terms"

X is different than x^2 because x^2 is x multiplied twice. For example, x^2= x*x. Yes,we combine terms that have the same exponent. They are called "like terms". To help you remember how to add and subtract integers you can draw a number line. 8m-2m is the same thing as 8m+-2m because if you subtract 8-2, it will be the same thing as 8+-2. Coefficients are numbers that are next to a variable. They are important because they tell you how many variables you have