What does the letter n mean in an algebra equation?

Answer 1

"n", as well as other letters, are used as variables. They can contain any value; quite often, you need to find out what value you should replace to make an equation valid. For example, in:

n + 1 = 4

In this case, if you replace "n" with "3", the equation will be satisfied (true); for any other value it won't.