I would like to ask whether it is within the rules that a user keeps deleting most of the original text of a question after getting an answer. I have in mind for example these questions (of the same user and thus probably why I noticed it):
My guess is that this is a way of trying to hide getting help with homework. I caught some students of mine in such a situation in the site, but from the topics this should not be my student.
Really it is a pity that the answers in these (and other) questions are of less help for others since the questions are not there, only the answers.