How are these numbers calculated?

Big Games

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

Week of 11/18100.0*Serie B100.0*Average seed
Fortaleza 1 Ponte Preta 0 +18.7
-0.4
Corinthians 1 Fluminense 1 -1.7
+0.0
Sao Caetano 0 Vasco da Gama 1 -1.3
+0.1
Juventude 3 Palmeiras 2 -1.1
Week of 11/26100.0*Serie B100.0*Average seed
Goias 3 Ponte Preta 0 +11.4
-0.2
Santa Cruz 1 Fluminense 2 +8.2
-0.1
Palmeiras 1 Internacional 4 -1.1
Sao Caetano 0 Parana 2 -0.5
+0.1
Juventude 2 Fortaleza 2 +0.0
Week of 12/2100.0*Serie B100.0*Average seed
Flamengo 4 Sao Caetano 1 +0.2
Points
Chance Will Win Championship