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 +20.6
Yes
+0.4
Vitoria 1 Corinthians 1 +5.2
+0.1
Cruzeiro 3 Vasco da Gama 1 -4.6
-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 +29.4
+0.4
Corinthians 2 Vasco da Gama 0 -16.4
-0.2
Flamengo 1 Cruzeiro 2 -13.1
-0.3
Week of 12/5100.0*Chance wins title100.0*Libertadores100.0*Average seed
Fluminense 1 Guarani 0 Yes
+0.6
Cruzeiro 2 Palmeiras 1 -20.0
-0.4
Goias 1 Corinthians 1 -1.3
-0.0
Points
Chance Will Win Championship