This book is terrible and cannot be recommended. Many of the things it says are simply wrong, like the opening discussions of 'orders of minuteness'. This book gives a lot of disinformation in attempts to simplify difficult topics, when all that is needed of these topics are clear unthreatening explanations. It does not deserve the popularity it has received for the last century. For a much better book to help a struggling student of introductory calculus, I can to no end highly recommend How to Ace Calculus: The Streetwise Guide by Colin Adams, et al.