How are these numbers calculated?

Big Games

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

Week of 11/18100.0*Serie B100.0*Average seed
Bahia 1 Ponte Preta 0 -13.5
+0.6
Sport 2 Botafogo 0 +11.5
-0.2
Flamengo 1 Palmeiras 1 -0.5
Portuguesa 2 Gremio 2 -0.3
+0.0
Sao Paulo 2 Nautico 1 -0.1
+0.1
Week of 11/25100.0*Serie B100.0*Average seed
Inter 0 Portuguesa 2 +6.5
-0.3
Sport 1 Fluminense 1 -2.0
+0.1
Bahia 1 Nautico 1 -0.8
-0.3
Cruzeiro 2 Coritiba 1 +0.2
Week of 12/1100.0*Serie B100.0*Average seed
Atletico-GO 0 Bahia 1 No
+1.1
Nautico 1 Sport 0 No
Portuguesa 0 Ponte Preta 0 +0.2
+0.0
Coritiba 3 Figueirense 0 -0.2
Points
Chance Will Win Championship