This is represented by a variable, usually some letter.
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A variable is just an unspecified number, not sure about the large part. Hope this helps. ;)
The term 7n means seven times some unspecified number. While this does not mean anything in isolation, it could be a meaningful part of an algebraic equation or other mathematical term.
A representation of a number in terms of powers of a base, such as the representation of 1234 as or the representation of 2345 as 2000 +...
Mathematical phrase is a number phrase which does not express a complete thought.
What is the base 10 representation of 1203^5