The Sketchpad activities in this collection give students the opportunity to directly experience, through dynamic visualization and manipulation, the topics covered in Precalculus. Students: - transform functions dynamically- view and modify entire families of functions--polynomial, exponential, logistic, and more- build parametric functions, and manipulate vectors and matrices- discover the relationship between rectangular and polar coordinates- make complex numbers come alive on the coordinate plane- finish with a dynamic, visual introduction to the main concepts of calculus.