## Objective:

**To evaluate variable expressions including expressions with exponents.**

## Vocabulary

**Variable**- a*letter*used to represent one or more numbers (It's called a*variable*because its value*varies*).**Algebraic Expression**- a collection of numbers, variables, operations, and grouping symbols.**Exponent**- a*number*used to represent repeated multiplication.- ex:
**5**is the^{3}= 5 · 5 · 5.

Five*base*,**3**is the*exponent*;**5**is called a^{3 }*power*.

- ex:
**Algebraic Equation**- an algebraic expression with an*equal sign*.

## Notes:

### How to Read an Exponent

*9*is read "^{2}" or "*nine to the second power*".*nine squared**9*is read "^{3}" or "*nine to the third power**nine cubed**9*is read "^{4}".*nine to the fourth power*