Tomas,
You are audacious if nothing else. You'll likely never get anyone on
the mailing list to do your homework for you, but you can get help if
you ask better questions in the future:
http://www.catb.org/~esr/faqs/smart-questions.html
In case you haven't found it yet, here's Maxima's manual online:
http://maxima.sourceforge.net/documentation.html
Typing two questions marks at the prompt followed by a term presents
you with a list of functions that may be useful:
(%i1) ?? matrix;
Good luck with your midterm.
--
Joshua Stults
Website: http://j-stults.blogspot.com