Okay, I've been around on this site for a few days but never introduced myself. I'm Richard and I'm from Tucson, AZ. I just graduated high school and I'll be going to MIT in the fall.
I tutor math part-time, and I'll be teaching MATHCOUNTS and AMC12 classes at a math camp next week. Did a bunch of math competitions in high school (including AMC and USAMO). I'm pretty familiar with rendering math expressions in LaTeX, so most of my problems/solutions will be typeset in LaTeX.
It is a pleasure to meet you all, and I look forward to helping/discussing math on MHF.