| A | B |
|---|
| variables | a symbol which represent number(s) |
| variable expression | a statement that contains a variable |
| grouping symbols | a device that encloses an expression |
| open sentence | k + 2 = 2 + k |
| domain | a given set of numbers that a variable may represent |
| formulas | are equations that state rules about relationships |
| distance formula | D = rate X time |
| addition | sum of numbers |
| subtraction | difference of a group of numbers |
| Multiplication | the product of numbers |
| division | the quotient of numbers |
| origin | point labeled zero |
| addition property of equality | If a = b then a+s = b+s |
| associative property of addition | (a+b)+c= a +(b+c) |
| associative property of multiplication | (ab)c = a(bc) |
| commutative property | for all real numbers a and b; a + b = b+a and ab =ba |
| reflexive property | a = a |
| symmetric property | If a = b then b = a |
| transitive property | if a = b and b = c then a = c |
| identity | an equation that is true for every value |
