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*Serie B100.0*Average seed
Botafogo 3 Sao Paulo 2 -20.8
+0.8
Sport Recife 0 Fluminense 3 +12.9
-0.2
Corinthians 2 Nautico 3 +1.8
Santo Andre 4 Avai 2 +1.7
-0.1
Santos 4 Coritiba 0 -1.0
Vitoria 2 Barueri 1 +0.7
-0.1
Atletico-PR 1 Cruzeiro 1 +0.4
Week of 11/29100.0*Serie B100.0*Average seed
Atletico-PR 2 Botafogo 0 +20.9
-1.0
Fluminense 4 Vitoria 0 +13.9
-0.2
Cruzeiro 4 Coritiba 1 -6.2
+0.2
Santo Andre 5 Nautico 3 +0.5
Avai 2 Santos 2 +0.0
Week of 12/5100.0*Serie B100.0*Average seed
Botafogo 2 Palmeiras 1 No
+0.8
Coritiba 1 Fluminense 1 +10.1
+0.2
Internacional 4 Santo Andre 1 +0.1
Points
Chance Will Win Championship