Is it possible to delete a post that has been responded to?
umm, y dont u try it right now?
no only a moderater can do that. if you want to erase your text and such then yeah, but you can’t delete the post itself.
Yes, Moderators can delete posts that have been replied to, but only if there is valid and objective cause. Please let me know if there is a post that requires our attention. 
FYI - You can certainly delete your own reply to a post if you feel the need. 