The textbook for the course is Precalculus by Jay Abramson, et al. The book is freely available online from OpenStax.
An alternate textbook for the course is Precalculus: An Investigation of Functions (2nd Edition), by David Lippman and Melonie Rasmussen. This book is also freely available online. (Lippman and Rasmussen are also contributing authors for the other book, so the two books are very similar.)