Answer
Yes.
i know how to just meet me online on call of duty 4 h match on mercenary team death match or team death match
sniper, dude
You can activate them in a xbox live private match
Yes, online connection is required in order to play with other people.
A private match is where you and your friends have a match and no one can join in.
No.
no
Only in a private match
Yes
the player that kills you the most in a match
750 points, 10 points per kill, so 75 kills
Well yes you can but call of duty 5,6 and 7 are the best call of duty's