How are these numbers calculated?

Big Games

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

Week of 11/14100.0*Serie A100.0*Average seed
Avai 2 Portuguesa 0 +17.1
+1.3
America-MG 3 Avai 0 -15.2
-0.9
Sampaio Correa 3 Boa Esporte 0 +5.1
+0.1
Boa Esporte 1 Joinville 0 -3.8
-0.2
Atletico-GO 1 Bragantino 0 -3.1
-0.2
ABC 1 Ceara 0 +2.9
+0.2
Luverdense 1 America-MG 2 -2.1
-0.2
Bragantino 2 Santa Cruz 1 +2.0
+0.1
Vasco da Gama 3 Vila Nova 1 -1.7
-0.1
Ceara 2 Vasco da Gama 0 -0.8
-0.1
Santa Cruz 0 Sampaio Correa 2 +0.2
Oeste 2 Nautico 0 +0.1
+0.1
Week of 11/21None
Week of 11/29100.0*Serie A100.0*Average seed
Avai 1 Vasco da Gama 0 +31.2
+1.2
Icasa 3 Boa Esporte 2 +13.6
+0.3
Atletico-GO 2 Santa Cruz 3 +6.8
+0.3
America-MG 4 Sampaio Correa 0 -1.7
-0.3
Luverdense 1 Ceara 0 +0.9
+0.2
Points
Chance Will Win Championship