n is a variable. It could mean any number you want it to. Most of the time, it is not specified what it is. Sometimes they give you clues about it, like "5 times n is 5." In this case n is 1.
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It represents a number. The number is the one which, when you multiply it by itself, the product is 'n'.
Let 'n' represent any number, and 'S' represent sum. S = 5 + 2n
a + (n-1)d = last number where a is the first number d is the common difference.
answer is maths.
a is used as a symbol to represent a variable.