The written assignments are a very important part of the course, so I expect you to put a lot of work into them. Your solutions should be written using full sentences and grammatical English. Try to write as though you were explaining to a friend who is not taking the course. You must do your own work. Every part of every assignment must be your own work, and not copied from another student or any other source.
Copying is plagiarism.
The strictest penalty that university regulations permit will be applied in such cases.