At this time you cannot delete your questions and answers on Ask.com.
If there is something objectionable or offensive posted to one of your questions or a comment to one of your answers, you can use the "Report as" feature to bring it to the attention of the moderators.
you can't delete a posted question or answer or comment you done. Only the moderators are able to do that. But for your recent questions and answers you can edit them if you want through 15 mins only from posting them.