What do numeral and the variable represent in ech expression

A variable takes place as the number, answer, or anything else you eed to find out in an equation

You can use it like this:

A=9+4

You can have multiple variables and you can put them anywhere in the equation as well.

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?