If a student is in school, I think all queries concerning his coursework are properly addressed to the relevant teacher/tutor/lecturer.
When I was still in school, my tutors where never able to learn me, but mostly learned FROM me. When they where trying to learn me something their explanation was mostly faulty or inaccurate and if I asked them something the answer mostly was: "I don't know.". In my total time of studying Technical Informatics (2.5 years) I had only 1 good teacher and he was the only one I ever learned stuff from...

I'm not defending him, since he should make his homework himself, however addressing questions to teachers isn't really usefull anymore, since most of them did a quick course into the subject they are teaching!