How are these numbers calculated?

Big Games

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

Week of 12/4100.0*Serie B100.0*Average seed
Atletico-MG 0 Paysandu 0 +8.3
-0.3
Juventude 1 Botafogo 0 -2.4
+0.1
Criciuma 1 Parana 2 -2.2
+0.1
Vitoria 1 Sao Paulo 4 -1.9
+0.1
Flamengo 0 Coritiba 0 +0.9
-0.0
Guarani 2 Figueirense 1 +0.8
-0.2
Corinthians 3 Vasco da Gama 1 -0.6
Santos 5 Gremio 1 +0.0
Week of 12/11100.0*Serie B100.0*Average seed
Gremio 0 Atletico-MG 1 -21.2
+1.1
Cruzeiro 4 Vitoria 0 -10.0
+0.2
Botafogo 1 Corinthians 2 -7.8
+0.2
Palmeiras 3 Criciuma 2 -3.8
+0.1
Sao Paulo 1 Flamengo 1 +1.9
-0.0
Paysandu 4 Guarani 2 -0.6
+0.1
Vasco da Gama 1 Atletico-PR 0 +0.2
-0.1
Week of 12/19100.0*Serie B100.0*Average seed
Atletico-MG 3 Sao Caetano 0 No
+1.5
Vitoria 1 Ponte Preta 2 -10.4
+0.2
Atletico-PR 1 Botafogo 1 +9.3
-0.2
Criciuma 3 Coritiba 3 +8.6
-0.1
Flamengo 6 Cruzeiro 2 -0.2
Points
Chance Will Win Championship