A variable expression includes variables.
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Numerical expressions solely include numbers, while algebraic expressions may contain a variable like x. An example of a numerical expression is 1+2 and an example of an algebraic expression is 2x+3y=0.
algebric uses variables and numerical uses numbers
A polynomial is a type of algebraic expression. They differ in the number of terms that contain variables. An algebraic expression has at least 1 variable, while a polynomial has multiple terms with variables in it.
A factor of an experiment is a controlled independent variable; a variable whose the differences between means for different levels of one factor.
An equation has an equal = sign whereas an expression does not.