yea, for #1 it's hard to write it with one line but it's (-155/375)y

and yes, my #5 is wrong, i have a full load of classes today, and as a matter of fact i'm going to "matrix theory" right now, i did that in sorta a rush (my excuse, obviously), so i'll try to work on it later.

It's sorta embrassing as an engineer to get algebra problems wrong, then again nasa crashed into mars cuz they forgot to convert :-P.

Cheers.

C. M. Ngan
Aerospace Engineering
University of Illinois at Urbana Champaign