Precalculus A Graphing Approach Author:Dale Varberg, Thomas D. Varberg This innovative book has been designed to cover all topics that have been intergral parts of the Precalculus curriculum for decades. However, the emphasis given to each topic has beeen altered to concentrate on topics that will prepare readers for further mathematic, science and business knowledge, especially those topics that can be more full... more »y explored with a graphing calculator.« less