Hi Jetperf,
I'm not an expert in any of your questions but you haven't had a reply in 9 hours, so here goes......
1/ 4%/10C deviation of the airmass beneath the aircraft.
(or 4ft per degree C per 1000ft)
2/ Modern engines will hold constant EPR but I think on older ones the EPR would decrease. That's why you have to have the thrust set by a certain speed.
3/ b)
4/ b)
5/ the CofP moves aft (hence 'mach tuck' and the need for mach trimmers on some types).
Hope this helps and good luck with the interview!