How are these numbers calculated?

Big Games

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

Week of 11/15100.0*Serie B100.0*Average seed
Juventude 1 Botafogo 3 -15.6
+1.7
Botafogo 2 Corinthians 4 +8.0
-1.5
Flamengo 1 Internacional 0 +5.3
-0.2
Sport Recife 1 Botafogo-SP 2 +3.1
-0.1
Coritiba 1 Santa Cruz 0 -2.8
+0.1
America-MG 1 Bahia 2 -2.3
+0.1
Sao Paulo 3 Flamengo 1 -1.8
+0.1
Botafogo-SP 2 Vitoria 0 +1.2
Gama 4 Atletico-PR 1 +1.1
-0.2
Portuguesa 1 Cruzeiro 3 +0.9
-0.2
Ponte Preta 1 Juventude 0 -0.4
+0.1
Bahia 2 Gama 1 -0.3
+0.1
Santa Cruz 2 America-MG 1 -0.1
+0.1
Guarani 1 Parana 0 -0.1
Sao Caetano 2 Guarani 0 +0.1
Vasco da Gama 2 Gremio 0 -0.2
Cruzeiro 1 Sao Paulo 4 +0.1
Parana 0 Fluminense 1 +0.0
Week of 11/24100.0*Serie B100.0*Average seed
Portuguesa 2 Botafogo 1 +0.1
-1.0
Week of 12/1100.0*Serie B100.0*Average seed
Botafogo 2 Sao Caetano 4 -0.6
Cruzeiro 4 Internacional 2 -0.4
America-MG 1 Juventude 1 -0.3
Flamengo 2 Palmeiras 0 -0.2
Points
Chance Will Make Playoffs