Inquirers could ask that a copy of articles posted to the newsgroup also be e-mailed, knowing that some persons will not comply with this request. Inquirers should post a summary of their e-mail responses to the newsgroup, out of consideration to the readership. You can, but most of the participants in k12.ed.math recognize these types of post, and realize that it is better for you to do your own homework than to have someone else do it for you. If you ask for help with your homework, you should indicate what progress you have made on the problem on your own so far, and what possible solutions you have considered. This will help respondents to give you appropriate suggestions as to what you should try next, without simply giving the full solution.
Specific questions are necessary in order to get a helpful response.
If it is specifically related to the kindergarten through 12th grade math curriculum, or is part of a math class project or assignment, yes. However, the reply rate to such requests is probably low. The moderator does not proofread, nor correct spelling or math errors. In general, however, the moderator would prefer to return such posts to the submitter and have the submitter edit the post and re-submit. Announcements of math workshops, math software, broadcasts, internet activities and websites are especially welcome.