These lesson plans (available in physical or digital format) correspond to Precalculus by Larson & Hostetler, 7th Edition, Houghton Mifflin, 2007 (ISBN: 9780618643448). This text is currently out of print and not available on our website, but you may be able to find it somewhere else online. The purpose of precalculus Memoria Press product: https://www.memoriapress.com/curriculum/math/precalculus-lessons/