This book is for the most part, the work of only one person, and not a collection of answers from lazy students, as this book pretends to be. On the cover, there is a triangle with two angles given, the hypotenuse is labeled "x". The test question says, "Find x". Someone has drawn an arrow pointing to "x", stating "here it is!" This joke has appeared many times on the internet, and it just may be genuine. But as you look at the rest of the questions in this book, the ridiculous answers are all the same sense of sarcasm throughout. Some of the answers are really funny, but the humor starts to wear off after a couple chapters, that's why I give it two stars.