Yes on search..7. Full-Text Search (Subscribers Only)
With this feature, you can search posts in specific boards, by specific people, or across the entire site to find the posts containing any word(s) you're looking for. The most recent 50 posts meeting your criteria are returned regardless of the age of the posts
I haven't got premium account up and running yet which would allow searches.
RE arithmetics. Most private schools have chronic problem retaining and staffing good math teachers. My high school was no different. I can remember zoning out a lot and figuring out relationships like difference between n squared and n+1 squared in my notebook. I was a real dull boy.<g>