This book is an absolute waste of time. If you didn’t know math already, you’ll never learn with this book. First off, it is filled with a bunch of copied and pasted formulas that yes pertains to math and in their relevant sections. But... there is no information or details about the origins and how to use it or any sort of example. Just a bunch of nonsense. It’s a good thing I’m strong at math already, just wanted a refresher and to see where I was at and how much I remember. Sure they have the right stuff in the right sections. But terrible! I’m pretty sure a good old fashioned text book will be so much more rewarding.