If the question is useless (or worse) you can downvote it. If there really is very little traffic and the question is never improved, upvoted, answered, etc. then the question will be auto-deleted after 30 days if it has a negative score.

You can vote to close it and it has a chance of being closed due to the close vote queue, but that's certainly not a sure thing. While closing such a question would of course be a good thing, if nobody is every looking at the question or trying to answer it it's also less helpful than closing questions that are attracting more attention, so trying to organize efforts to close such questions isn't a high priority.

If the question is answered in comments, and is actually an appropriate and on topic question, then post an answer with the solution (citing the work of others as appropriate).

If the question is useless (or worse) you can downvote it. If there really is very little traffic and the question is never improved, upvoted, answered, etc. then the question will be auto-deleted after 30 days if it has a negative score.

You can vote to close it and it has a chance of being closed due to the close vote queue, but that's certainly not a sure thing. While closing such a question would of course be a good thing, if nobody is ever looking at the question or trying to answer it, then closing it is also less helpful than closing questions that are attracting more attention, so trying to organize efforts to close such questions isn't a high priority.

If the question is answered in comments, and is actually an appropriate and on topic question, then post an answer with the solution (citing the work of others as appropriate).