| A | B |
|---|
| variable | a letter used to represent one or more numbers |
| variable expression | an expression containing operations with variables or with variables and numbers |
| terms | parts of an expression separated by a + or - sign |
| constants | a term that is a number |
| coefficients | a number that multiplies a variable |
| like terms | numbers or terms that have the same variable and the same exponent |
| simplify a variable expression | combine like terms |
| combine like terms | add or subtract the coefficients of the variables |
| substitute | replace a variable with a number |
| evaluate a variable expression | find the value by substituting numbers for the variables |
| volume | the number of cubes needed to fill a space |
