How are these numbers calculated?

Big Games

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

Week of 11/21100.0*Chance wins title100.0*Libertadores100.0*Average seed
Sao Paulo 1 Fluminense 4 +17.0
Yes
+0.4
Vitoria 1 Corinthians 1 +9.0
+0.1
Cruzeiro 3 Vasco da Gama 1 -3.0
-0.2
Botafogo 1 Internacional 2 +0.1
Week of 11/28100.0*Chance wins title100.0*Libertadores100.0*Average seed
Palmeiras 1 Fluminense 2 +25.8
+0.4
Corinthians 2 Vasco da Gama 0 -13.5
-0.2
Flamengo 1 Cruzeiro 2 -9.3
-0.2
Week of 12/5100.0*Chance wins title100.0*Libertadores100.0*Average seed
Fluminense 1 Guarani 0 Yes
+0.5
Cruzeiro 2 Palmeiras 1 -9.0
-0.3
Goias 1 Corinthians 1 +7.3
+0.1
Points
Chance Will Win Championship