PEMDAS – tells which operation is performed first so that everyone finds the same value for an expression

contains at least one variable and at least one operation

a symbol, usually a letter, used to represent a number

The number that is multiplied by a
variable

 $\rightarrow6x$  

Each part of an algebraic expression separated by a plus or minus sign $4x-2^2$  

The order in which numbers are added

or multiplied does not change the sum or product

The way in which numbers are grouped

does not change the sum or product

Property that states the sum of any number and 0 equals the number and that the product of any number and 1 equals the number

Expressions that have the same value $2^2+3=2\times2+3$  

A term without a variable

 $7x+2x+8\leftarrow$