And how much i trusted feedback is worth?
You can find that information on the same linked thread:
https://bitcointalk.org/index.php?topic=1066857.0
To make it short every positive trusted feedback left by a unique member adds +1 every month up to +10 (after 10 months).
Negative works like this: -2^(unique trusted negative feedback).
Check the above thread if you want the full information.
i have an alt with +1 positive from OgNasty and it's black
Which account is it? 
I'll not reveal it, but if you start spamming names I will say when you got it