| absolute value | the value of a number without regard to its sign |
| inequality | a math sentence that defines a range of numbers; inequalities contain the symbols <, ≤, >, or ≥ |
| Properties of Inequality | a set of rules for inequalities that describe how addition, subtraction, multiplication, or division can be applied to both sides of an inequality in order to produce an equivalent inequality |
| ray | a half-line beginning at one point and continuing to infinity |