# Lesson 1.1, Real Numbers Evaluate: 1. 2. 3. ANSWER.

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Lesson 1.1, Real Numbers Evaluate: 1. 2. 3. ANSWER

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PRE Lesson 1.1-Tools of Algebra Objectives:
To review the set of Real Numbers To review the properties of Algebra To understand interval and set notation.

Sets & Elements A set is a collection of objects.
- the objects are called the elements of the set. If S is a set, the notation of means that a is an element of S.

Sets & Elements means that b is not an element of S.
Ex1. If Z represents the set of integers, then but

Union of Sets If S and T are sets, then , represents their union. The union of sets consists of all elements in both sets. Ex 2. Find if

Intersection of Sets The intersection of S and T is the set consisting of all elements that are in both sets. It is only what they have in common. Ex 3. Find if

Notation of Sets The set A that consists of positive integers less than 7 Braces { } Set-builder notation – “A is the set of all x such that x is an integer and “ Interval notation – Is a way to write the domain and the range. (0,7)

b b

Ex 4. Find, , ,

Classwork: Book: pg.11, 36-60 even