How are these numbers calculated?

Big Games

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

Week of 11/19100.0*Libertadores100.0*Average seed
Flamengo 3 Corinthians 0 +28.8
+1.4
Sport Recife 1 Bahia 0 +5.3
+0.2
Atletico-PR 3 Vasco da Gama 1 +4.1
+0.1
Sao Paulo 0 Botafogo 0 +2.3
+0.1
Atletico-GO 1 Chapecoense 1 +2.3
+0.1
Atletico-MG 3 Coritiba 0 -1.9
-0.1
Vitoria 1 Cruzeiro 1 +0.0
Week of 11/25100.0*Libertadores100.0*Average seed
Palmeiras 2 Botafogo 0 +4.2
+0.2
Week of 12/3100.0*Libertadores100.0*Average seed
Vitoria 1 Flamengo 2 Yes
+1.5
Atletico-MG 4 Gremio 3 -9.9
-0.3
Chapecoense 2 Coritiba 1 -9.6
-0.3
Vasco da Gama 2 Ponte Preta 1 -4.9
-0.2
Botafogo 2 Cruzeiro 2 +4.9
Points
Chance Will Win Championship