I am a college freshmen, and I needed this book for my freshman chemistry class. First I tried the book store, bought the book and realized i paid way to much. Took it back then I tried [...] as it appeared to be really cheap. Well when I received the book I discovered that is had the wrong connect code, and the same thing happened to my roommate. After a 20 min online chat with a representative who wasn't super helpful I decided to send that book back. Then I saw on amazon. I received the book on time with the correct connect code. Moral of the story always trust amazon.