confuser
The confuser is aptly named . . .
There are also occasional typographical errors (I seem to recall one in lat/long, and one in specific gravity) so if you don't get the *exact* answer they do, don't be overly upset. It is more important that you inderstand what concepts they are trying to get you to learn than to correctly answer some of the seemingly contrived questions in the book.
It is an adjunct to your course, but it is in no way a substitute. Don't be afraid to ask questions and ask for explanations, too.
Best Regards,
Echo Mike