LaTeX won't render the 2 in my thick shell inertia equation

[Will]

#$%& latex problems!

Someone please look at my "rotational inertia of a thick spherical shell" post under "Classical Physics" please. First off, when I previewed my post, most came out ok, but the "2" in the numerator just would not show. But when I submitted the post, it said that I had done it incorrectly, I just got the error message.

 

[master_coda]

You have a "\" in front of the 2.