Page 581 - Basic College Mathematics with Early Integers

8 Introduction to Algebra

8.1 Variable Expressions
8.2 Solving Equations: The Addition
Property
8.3 Solving Equations: The
Multiplication Property
Integrated Review—Expressions
and Equations
8.4 Solving Equations Using Addition
and Multiplication Properties
8.5 Equations and Problem Solving
In this chapter we make the transition from arithmetic to algebra. In algebra, letters are used to stand for unknown
quantities. Using variables is a very powerful tool for solving problems that cannot be solved with arithmetic alone.
This chapter introduces variables, algebraic expressions, and solving variable equations.
Vocabulary Check
Chapter Highlights social network site or service consists of a profile or representation of each
user, his/her social links, and a variety of other services, including a way for
Chapter Review
Ausers to interact over the Internet. Although Google is the current most
Chapter Test popular Internet site, a social networking site called Facebook is the second most
Cumulative Review popular, after only 6 years in existence. Some social networking sites concentrate on
entertainment, some on career-minded professionals, and some, like Twitter, let
members send out short, 140-character messages called “tweets.”
In Section 8.5, Exercises 65 and 66, we explore numbers of computers in
general in select countries.

Top 5 Social Networking Sites

Twitter

Baidu
Website MySpace

Windows Live

Facebook

100 200 300 400 500
Source: comScore Total Unique Visitors (in millions)
Note: Recently, the Facebook Web site increased to 500 million users.
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