Q: i cant activate my i pad mini , i got this from my friend but he dont know his apple id or password

if you cant locate the original owner for the apple id and password you guys are pretty much out of luck....if your friend knows what emails he had in the past he may be able to figure out his apple id from appleid.apple.com>find apple id

I suspect your friend acquired the device under less than ethical circumstances. Unless your friend can produce the required information you are holding a worthless brick.

Honestly sounds like a stolen device.  Turn it into law enforcement and seriously reconsider whether this person that gave you the laptop is truly a friend or not.