This book is the best seller of the Tan series. It has been extensively revised and has incorporated many valuable comments and suggestions form both users and reviewers. The writing style, applications, exercises, treatment of systems of equations, and examples have always been high points of the text. The text incorporates technology through the addition of computer/graphing calculator exercises and applications are very in tune with every day life scenarios in all types of disciplines. The new use of four color enhancement has brought this text up to speed with the main competitors.