How are these numbers calculated?

Big Games

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

Week of 2/6100.0*Libertadores100.0*Average seed
Atletico-GO 1 Santos 1 -5.4
-0.2
Botafogo 2 Gremio 5 -1.0
-0.0
Week of 2/13100.0*Libertadores100.0*Average seed
Santos 2 Coritiba 0 +12.1
+0.7
Flamengo 2 Corinthians 1 +5.4
+0.1
Athletico-PR 2 Atletico-GO 1 -2.3
-0.1
Gremio 1 Sao Paulo 2 +0.6
Palmeiras 3 Fortaleza 0 -0.5
Sao Paulo 1 Palmeiras 1 -0.1
Week of 2/20100.0*Libertadores100.0*Average seed
Gremio 1 Athletico-PR 0 +9.9
Goias 0 Bragantino 0 +3.2
+0.1
Corinthians 0 Vasco da Gama 0 +1.8
+0.0
Santos 1 Fluminense 1 +1.2
-0.1
Points
Chance Will Win Championship