How are these numbers calculated?

Big Games

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

Week of 11/17100.0*Serie B100.0*Average seed
Palmeiras 4 America-MG 0 +19.9
-0.9
America-MG 2 Santos 1 -16.4
+0.8
Vasco da Gama 2 Sao Paulo 0 +4.5
-0.1
Ceara 1 Parana 0 +4.5
-0.1
Cruzeiro 3 Vitoria 0 -3.0
+0.2
Gremio 2 Chapecoense 0 -2.5
+0.1
Vitoria 1 Atletico-PR 2 -1.7
+0.1
Sport Recife 0 Flamengo 1 -1.7
+0.1
Chapecoense 2 Sport Recife 1 +1.6
-0.1
Corinthians 1 Vasco da Gama 0 -0.6
Bahia 2 Fluminense 0 -0.2
Atletico-PR 1 Corinthians 0 -0.2
Atletico-MG 1 Bahia 0 -0.1
Week of 11/25100.0*Serie B100.0*Average seed
America-MG 1 Bahia 0 -22.8
+1.0
Corinthians 0 Chapecoense 0 +1.2
-0.1
Internacional 2 Fluminense 0 -0.8
+0.1
Vasco da Gama 0 Palmeiras 1 -0.5
Vitoria 0 Gremio 0 -0.4
+0.1
Atletico-PR 2 Ceara 2 -0.2
Week of 12/1100.0*Serie B100.0*Average seed
Fluminense 1 America-MG 0 Yes
-1.4
Chapecoense 1 Sao Paulo 0 +5.7
-0.3
Sport Recife 2 Santos 1 +5.7
-0.4
Palmeiras 3 Vitoria 2 +0.1
Points
Chance Will Win Championship