College Algebra in Context, Fourth Edition,is ideal for students majoring in business, social sciences, and life sciences. The authors use modeling, applications, and real-data problems to develop skills, giving you the practice you need to become an adept problem solver in your future courses and career. This revision maintains the authors' focus on applying math in the real world through updated real-data applications. Features such as Group Activitiesand Extended Applicationspromote collaborative learning, improve communication and research skills, and foster critical thinking.

**Ron Harshbarger** got his BS from Shippensburg State, an MST from the University of New Hampshire, did graduate work at Penn State University, and received a PhD from the University of Pittsburgh. During a long and highly successful career at Penn State University, Dr. Harshbarger received both teaching and advising awards. At Georgia Southern University, he taught a wide variety of undergraduate and graduate courses in mathematics, developed five new mathematics courses, and created the mathematics component for a new doctoral degree.

At the University of South Carolina Beaufort, Dr. Harshbarger was named Professor of the year in 1999. In 2000, Professor Harshbarger was named the Governor’s Professor of the Year for the State of South Carolina. In 2001, the University of South Carolina Board of Trustees named him the Trustee Professor of the Year. In 2002, he received the Mathematical Association of America Southeastern Section Award for Distinguished University Teaching of Mathematics. He was nominated for the 2003 Haimo Award for Distinguished College or University Teaching of Mathematics, a national award given by the Mathematical Association of America. In 2003, he was also named Professor of the Year at the University of South Carolina Beaufort and given the Governor’s Distinguished Professor Award for the state of South Carolina.

**Lisa Yocco** received her undergraduate degree in mathematics from Augusta State University and her graduate degree in mathematics education from Florida State University. She has taught at both the college level and the high school level for twenty years, with her most recent experience at Georgia Southern University. She has co-authored several manuals in mathematics and graphing calculators and has presented workshops and papers at numerous conferences. In addition to her textbook writing and teaching, she enjoys spending time with her three children, cooking, and working on interior decorating.

Contents

Preface

List of Supplements

To the Student

**1. Functions, Graphs, and Models; Linear Functions**

Algebra Toolbox

1.1 Functions and Models

1.2 Graphs of Functions

1.3 Linear Functions

1.4 Equations of Lines

Summary

Key Concepts and Formulas

Chapter 1 Skills Check

Chapter 1 Review

Group Activities/Extended Applications

**2. Linear Models, Equations, and Inequalities**

Algebra Toolbox

2.1 Algebraic and Graphical Solution of Linear Equations

2.2 Fitting Lines to Data Points: Modeling Linear Functions

2.3 Systems of Linear Equations in Two Variables

2.4 Solutions of Linear Inequalities

Summary

Key Concepts and Formulas

Chapter 2 Skills Check

Chapter 2 Review

Group Activities/Extended Applications

**3. Quadratic, Piecewise-Defined, and Power Functions**

Algebra Toolbox

3.1 Quadratic Functions; Parabolas

3.2 Solving Quadratic Equations

3.3 Piecewise-Defined Functions and Power Functions

3.4 Quadratic and Power Models

Summary

Key Concepts and Formulas

Chapter 3 Skills Check

Chapter 3 Review

Group Activities/Extended Applications

**4. Additional Topics with Functions**

Algebra Toolbox

4.1 Transformations of Graphs and Symmetry

4.2 Combining Functions; Composite Functions

4.3 One-to-One and Inverse Functions

4.4 Additional Equations and Inequalities

Summary

Key Concepts and Formulas

Chapter 4 Skills Check

Chapter 4 Review

Group Activities/Extended Applications

**5. Exponential and Logarithmic Functions**

Algebra Toolbox

5.1 Exponential Functions

5.2 Logarithmic Functions; Properties of Logarithms

5.3 Exponential and Logarithmic Equations

5.4 Exponential and Logarithmic Models

5.5 Exponential Functions and Investing

5.6 Annuities; Loan Repayment

5.7 Logistic and Gompertz Functions

Summary

Key Concepts and Formulas

Chapter 5 Skills Check

Chapter 5 Review

Group Activities/Extended Applications

**6. Higher-Degree Polynomial and Rational Functions**

Algebra Toolbox

6.1 Higher-Degree Polynomial Functions

6.2 Modeling with Cubic and Quartic Functions

6.3 Solution of Polynomial Equations

6.4 Polynomial Equations Continued; Fundamental Theorem of Algebra

6.5 Rational Functions and Rational Equations

6.6 Polynomial and Rational Inequalities

Summary

Key Concepts and Formulas

Chapter 6 Skills Check

Chapter 6 Review

Group Activities/Extended Applications

**7. Systems of Equations and Matrices**

Algebra Toolbox

7.1 Systems of Linear Equations in Three Variables

7.2 Matrix Solution of Systems of Linear Equations

7.3 Matrix Operations

7.4 Inverse Matrices; Matrix Equations

7.5 Systems of/onlinear Equations

Summary

Key Concepts and Formulas

Chapter 7 Skills Check

Chapter 7 Review

Group Activities/Extended Applications

**8. Special Topics: Systems of Inequalities and Linear Programming; Sequences and Series; Preparing for Calculus**

8.1 Systems of Inequalities

8.2 Linear Programming: Graphical Methods

8.3 Sequences and Discrete Functions

8.4 Series

8.5 Preparing for Calculus

Summary

Key Concepts and Formulas

Chapter 8 Skills Check

Chapter 8 Review

Group Activity/Extended Application

Appendix A: Basic Calculator Guide

Appendix B: Basic Guide to Excel 2003 and Excel 2010

Answers to Selected Exercises

Index