1. Interval Notation (, ) ; (, ]; [, ); [, ]

2. Inclusive or not… Brackets include the number in the solution set Parenthesis signify the number is not part of the solution set Infinity is not a specific number and is always labeled with a parenthesis When a solution set is a compilation of parts of a number line then we use the union symbol

3. Practice Interval Notation ) -5 (0(0 ]5]5 [ 10 ] -12 (3(3 [7[7 )9)9 ] -3 (7(7 ] -15

4. Inequality Notation ] -3 (7(7 ] -15 ) -5 (0(0 ]5]5 [ 10 ] -12 (3(3 [7[7 )9)9 x ≤ -3 or x > 7 x ≤ -15 x 0 x ≤ -12 or 3 <x ≤5 or 7 ≤ x< 9 or 10 ≤ x