I came across this deleted question (10k+ only) in the mod tools overview. I don't understand why the question was deleted.
As far as I can see, it is a completely appropriate, non-spammy, non-offensive question. Looks a bit like homework, but actually shows some independent work, which puts it well above the median question quality here. It had answers that look good, one of them accepted, but no votes or comments on either question or answers. It does not seem to have been closed before it was deleted by a moderator with no comment or explanation.
I flagged the question, with a message that the deletion must have been a misclick somehow. That flag was returned as "helpful" but the question remains deleted. What's going on here?
I can imagine two possibilities, but I hope there's a third one I didn't consider:
The asker somehow annoyed the moderator enough to "deserve" a point-blank deletion in retaliation. No such cause is apparent in the user history I can see, but of course comments seem to really disappear when they are deleted.
The OP discovered that asking the question here was in violation of a school policy that could get him into deep trouble, and so flagged the post to have a moderator delete it for him.
The latter hypothesis intuitively feels more charitable, but upon further thought I still think it is quite problematic. The question had already been answered, and the answer was good enough that the OP accepted it. So if there was an academic violation, the cheating had already happened and the deletion was only to help destroying the evidence.
I'm cool with not having a policy against homework; whether people use MSE to cheat or not is primarily a matter between them, their conscience, and their school. But a "we will help you cheat and then also help you cover it up afterwards" policy -- if indeed that's what is happening -- would be crossing a line I'm not comfortable with.