It may seem lame for us to just give you a YouTube link, but this one is special. It is a link to one of PatrickJMT's videos. These are great and there is a ton of him. Don't be afraid to check out his whole YouTube Channel.
Extension time. This Virtual Nerd video shows you how to graph, yes graph, complex numbers. Check it out. It might be useful someday. Oh, and there are other Virtual Nerd videos too just in case you're not quite ready to make the jump into imaginary mathematics.
This could technically go under tools or videos but there is a lot to do here. You can watch a 14-minutes video all about radical equations, download a 27-question practice sheet, or just do a few guided practice problems right there. Don't be afraid to surf around for more topics.
Need more radical practice? Here you go. CPM provides an overview in case you forget, a ton of practice problems, and even the answers. This gives a new meaning to the age-old expression: simplifying radicals until you drop.
Need to calculate an exponent, here's your site. That is literally all it is. However, you could just type "2 to the tenth" into Google. Don't forget about our ^ friend.
Check out this super handy graphing calculator. You're welcome.
Paul's Note is where it's at if you're a reader not a watcher. No, that has nothing to do with being a lover not a fighter. Or does it?
The Math Dude knows what's up. This is the link to the negative exponents page of his site but he has other solid info on there as well.
Just because it is pretty awesome, here is a link to a Yale professor's lecture notes on exponents and their real-world applications. Yes, Yale. Things start out basic and then slowly get crazy and awesome at the same time.
Purple math has yet another form of explanation for the web-reader in all of us. Whatever radical topic you need, they have it.