The homework tag is a meta-tag, which is explicitly discouraged. Should we delete the homework tag from all questions? Although a question may be about homework, there's nothing useful gained by tagging a question "homework".
homework is one of the few meta tags still allowed since we welcome homework question on the Trilogy.
More on homework on MSO: Is [homework] an exception to the no-meta-tag rule?
More on the homework topic on MSO: https://meta.stackexchange.com/questions/10811/how-to-ask-and-answer-homework-questions