How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 11/24100.0*Serie B100.0*Average seed
Fluminense 3 Juventude 2 Yes
-0.2
Week of 12/2100.0*Serie B100.0*Average seed
Juventude 2 Sport Recife 1 +0.2
Vasco da Gama 3 Parana 0 +0.1
Points
Chance Will Win Championship