Pre-Calculus in 2012

Twenty Key Ideas in Beginning Calculus by Umbarger, Dan

Pre-Calculus Demystified, Second Edition by Huettenmueller, Rhonda

Twenty Key Ideas in Beginning Calculus by Umbarger, Dan

McGraw-Hill's 500 College Precalculus Questions: Ace Your College Exams: 3 Reading Tests + 3 Writing Tests + 3 Mathematics Tests by McCune, Sandra, Clark, William H.