Section 1.1 and 1.4

rational numbers integers 0.5 -5 -2 whole numbers counting/natural #s 1 2 3

The rational numbers combined with the irrational numbers make up the set of Real Numbers. integers irrational numbers whole numbers Counting/natural numbers REAL NUMBERS 5/8/2019 6:36 PM 1-1: Sets of Numbers 3 3

Intervals (3, 5) 3 < x < 5 An interval is a set of all numbers between two endpoints, such as 3 and 5. The following symbols are used in interval notation. Brackets [ ] : DO include endpoints INCLUSIVE Parentheses ( ) : used to exclude endpoints The set of real numbers between but not including 3 and 5. (3, 5) -2 -1 0 1 2 3 4 5 6 7 8 3 < x < 5 5/8/2019 6:36 PM 1-1: Sets of Numbers 4 4

Writing in Interval Notation Numbers less than 3 Inequality Graph -2 -1 0 1 2 3 4 5 6 7 8 Interval notation

Writing in Interval Notation Numbers greater than or equal to -2 Inequality Graph -2 -1 0 1 2 3 4 5 6 7 8 Interval notation