n will typically mean number. It can stand for any given number, and what it stands for will depend on the problem.
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The question should be what is the variable in the following expression? (n + 5) The answer: (n) represents the variable. See: Variable(English definition) then look up the Math/Algebra definition.
5n (also known as 5xn)=10, which means n=2. n is the variable. 5-n=2 which means n=3 5/n (I'm trying to say 5 over n, also known as 5 divided by n)=20, which means n=0.25. 5+n=7 n=2.
any number at all
A variable is an unknown number represented by a letter
An equation with a variable is a math problem with a missing number that you have to find out using some specific steps that you are taught. Example: 4+n=5. If you want to find out what the variable is, you have to do the OPPOSITE OPPERATION and find it out. So I would take the answer, and do the opposite operation and then the answer is the variable. Of course there are MUCH harder variable equations. :D