This text encourages the understanding of precalculus mathematics through a clear and direct writing style, and discussions of the individual topics and their relevance to calculus. It features comprehensive coverage of trigonometry. Systems of equations and inequalities are discussed in a complete chapter, as are sequences and series. The overall clarity is complemented by the thorough treatment of problem solving and the extensive use of examples, graphs and illustrations. This book should be of interest to degree and diploma students taking courses in precalculus and calculus.