Questions about the common app ECs

<p>Can a paid job count as an EC? Also, should I mention the things I've done over the summer? Most of them are academic in nature:
the summer of 2007, I did a full year's worth of geometry at a local public school because my then-school didn't offer geometry
the summer of 2008, I did a non-credit refresher course in algebra 2 (I was changing schools and the new school asked me to... otherwise they'd place me in trigonometry instead of pre-calculus)
the summer of 2009, I did the NSLC Forensics program, as well as a 2-credit college class offered by American University in conjunction with NSLC. I also covered a year's worth of Latin by myself.</p>

<p>If I should mention them, where should I write about it?</p>

<p>Thanks!</p>