Book excerpt: Preparation for Calculus: Functions and How They Change equips students with the necessary skills and confidence to succeed in their current precalculus course and beyond as a calculus student. The authors have written a unique precalculus text for today’s students: focusing on challenges observed in the modern classroom, rather than retrofitting antiquated practices to fit the present-day student. Preparation for Calculus promotes the deep integration of digital resources with easy-to-understand textbook content to develop strong calculation skills and mathematical sophistication.