it means you should ask your math teacher
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i think it means an algebraic expression
In mathematics, an expression is a finite combination of symbols that are well-formed according to the rules applicable in the context...
The expression, in elementary mathematics is y2 - y1. In basic calculus it is dy.
substitution
The number or expression that is used as a factor in a repeated multiplication base could also mean the type of number system being used.Binary is base 2 mathematics normal everyday mathematics such as 9+9=18 is base 10