Basically the same way that you evaluate other types of expressions with variables:
* You replace the variables by the value assigned to the variables.
* Then you do the specified calculations.
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For the greatest common factor, you check which variables appear in each of the expressions. In the case of exponents, you take the lowest exponent for each variable. For the least common multiple, you take each variable, whether it appears in all of the expressions involved, or only in some of them. In the case of the exponents, you take the greatest exponent for each variable. If there are numeric coefficients (numbers as products), you take either the gcf or the lcm of those in the usual way.
Yes.
An algebraic expression is a process for evaluating expressions. Replacing variables with numerals and following a standard order of operations is used for the process.
It is "evaluating".
Yes. When you divide one variable with an exponent from another, you subtract the exponents