1. Közösség
2. General Khan Academy Questions
3. How do I find my KAID number?

You can remove Firefox add-ons such as the Khan Academy Extension by entering "about:addons" in your address bar. You can also get a user's KAID by visiting khanacademy.org/api/internal/user/profil...

1. Közösség
2. Study Group
3. This doesn't seem right

It looks like the key here is that the i is not under the square root sign,  so √10i in that picture is equivalent to i√10.