How are these numbers calculated?

Big Games

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

Week of 11/21100.0*Serie B100.0*Average seed
Avai 3 Atletico-GO 0 +2.5
-0.1
Palmeiras 0 Atletico-MG 2 +2.2
-0.1
Vitoria 1 Corinthians 1 +1.0
-0.0
Goias 1 Santos 4 -0.1
+0.1
Week of 11/28100.0*Serie B100.0*Average seed
Guarani 0 Gremio 3 Yes
-0.2
Avai 3 Santos 2 +2.3
-0.1
Flamengo 1 Cruzeiro 2 -0.4
Atletico-MG 3 Goias 1 +0.2
+0.0
Internacional 1 Vitoria 1 +0.1
-0.0
Week of 12/5None
Points
Chance Will Win Championship