This book reads more like a rushed, last minute assignment than a professional textbook. It contains glaring mistakes in example problems. e.g. the text claims that 230/5=16. It's not just an innocent typo, the worked example is wrong from roughly halfway through. It should have been immediately obvious to the authors if they'd made a thorough second pass through their work. Unfortunately, this seems not to be the case. Furthermore, the explanations are just bad. e.g. "Probability is the study of chance and probability". Very descriptive. There are so many other instances of poor explanations in this book that I'm stunned anybody with math qualifications would put their name to it. You're much better of with the plethora of free online resources. Google any particular topic and you'll receive pages of quality matches that are mostly error free and actually give insight into a topic. My partner is required to use this text for her course. I have a degree in math and physics, so I'm familiar with all the methods in this book. I've also tutored this kind of math for many years. I wouldn't use this as a teaching resource even if it was free.