This is an excellent extension textbook to use as a supplement in a first or second year calculus class. The problems are especially enjoyable and have the flavor of the type of problems one might find in mathematical competitions. I would recommend it to anyone who desires to develop the needed mathematical maturity to progress beyond introductory calculus classes.Here you'll find solutions to the problems that I wrote up as I worked through this excellent book. Some are more challenging than others but I believe the serious student will learn a great deal from studying this text.