You have to figure that out! Variables, in math, are there because you need to find them and figure the problem out. Usually, on the side it tells you what the variables mean, or you have to find that variable by making the equation make sense if they give u the answer.
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If you are talking about math wise then an example of a variable would be any letter in the alphabet. For example in the expression "x-3m" m and x are variables.
any number at all
A variable is an unknown number represented by a letter
a variable.
There is no term other than independent variable.