52. 1+3+6+10+15+...+28
58. [unparseable or potentially dangerous latex formula]
and
78. Change [unparseable or potentially dangerous latex formula] to a base 4 decimal
oh! and there was this question:
If [unparseable or potentially dangerous latex formula] is written as the mixed number [unparseable or potentially dangerous latex formula] then [unparseable or potentially dangerous latex formula] is?
I know you do [unparseable or potentially dangerous latex formula], but what do I do if it asks me for [unparseable or potentially dangerous latex formula] or [unparseable or potentially dangerous latex formula]?