I don't think you're doing anything wrong, I'd probably do the same thing. Well, like you said, you just check your answers to see if you're doing them right. No use in failing without even knowing it until there's a big fat F on your paper. Plus, our text books always have the odd numbered answers. My friend has a website with all the answers to our Pre-Calculus assignments, but you have to have a password and pay monthly. Apparently he got it for free, checks his answers, and pretty much gets A's on all the tests, and has an A in the class. But of course you can't necessarily trust everyone with the answers, because chances is are they'll use them for the wrong reasons.