| A | B | 
| variable | It is a symbol, usually a letter, that represents one or more numbers. | 
| algebraic expression | It is a mathematical phrase that | 
| equation | It is a mathematical sentence that uses an equal sign. | 
| open sentence | An equation that contains one or more variables | 
| simplify | To do this to a numerical expression, you replace it with its simplest name. | 
| power | This has two parts, a base and an exponent | 
| exponent | This tells homw times a number is used as a factor. | 
| base | Is the number that is used as the factor. | 
| evaluate | This is done to an algebraic expression by substituing a given number for each variable. |