Talking about the questions being Googleable and Algebra, maybe you should totally check out
this algebra solver I just literally Googled up less than a minute ago, with no prior knowledge of its existence. That should be proof enough that algebra is not Google-proof. I'll bet that there's an algebra solver out there that can deal with calculus as well. But I suppose that WoodenRat had already explained why math is not a very good gauge of intelligence already.
I suspect that the problem about this requirement some of you are trying to implement is that you actually have no idea what the end result you actually want. All you just think is "filter out people I don't like." I daresay you won't be able to actually use "filter out immature idiots" since some of you here *are* pretty immature in your own way, but that's just my opinion.
While I don't really care about "immature idiots", since it's not like they're murdering my family and burning down my house by being a horrible human being, and I don't really care about any changes to this forum, I suggest a solution:
We get a "Guest forum" for people that signs up. They can not post in any other places. They have to apply to the moderators to be a "Forum Member". But hey, that would be kind of annoying to Noxid (who I think is the only moderator here? Or at least the only moderator who does something.) for him having to read through PMs and deciding whether to accept new members or not, plus, it would likely murder our site traffic. (but it's not like any of you here want new members anyways?)
So ultimately it's up to Noxid, and I think he is fine with the policy as-is, and probably doesn't want to sort out applications. That's what I think he thinks, at least.