Digital electronics(modern digital design)review what i have and help

20 questions, almost all are completed, just a few I could not get.  Need someone to look over what I have to check for mistakes and help out with 2 or 3 questions I could not complete.  Please see attached, all FIG diagrams are on the attachment and labeled.  Price is negotiable, but it really is just checking the answers I have and a few problems that I could not figure the answers to.