B.O.B. 2

For them most part, this past week has been pretty easy for me.  However, the whole maximum area stuff is pretty difficult.  I understand the concept, but I'm lost in starting the setup of the problem.  I'm still working on that problem in the packet.  Everything else is easy for me; it's just 3b that I'm having trouble with.  So maximum area problems are my muddiest points.