No you can only play mw3 on xbox 360 (and pc and ps3 of course) not on xbox.
you absolutly can't
like about 500 tonns
it dosent cost anything
You cannot play infection on mw3 wii version. But people found it by hacking.
Play more and read the wiki on MW3
No.
You can't play.
yes of coarse
Probably not
Yes you can.
MW3 at Gamestop is $60 plus tax.