An Electronic Companion to Precalculus by Charles P. McKeague, C. Patrick McKeague and Denny Burzynski is available now from Amazon.com.

This CD-ROM/Workbook package can accompany any textbook used in a college precalculus course. 

An Electronic Companion to College Algebra, by the same three authors is also available now.

Contact Cogito Learning Media for details about either of these products.