How are these numbers calculated?

Big Games

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

Week of 4/2100.0*Semi-Final100.0*Average seed
Bangu 2 Boavista 1 +0.9
+0.4
Vasco da Gama 1 Volta Redonda 1 -0.3
-0.0
Botafogo 2 Flamengo 2 +0.1
Madureira 1 Fluminense 3 +0.0
Week of 4/9100.0*Semi-Final100.0*Average seed
Botafogo 1 Bangu 0 No
-0.3
Flamengo 3 Boavista 0 +0.3
+0.0
Volta Redonda 0 Fluminense 2 +0.1
Vasco da Gama 1 Madureira 0 +0.1
+0.1
Week of 4/17100.0*Semi-Final100.0*Average seed
Bangu 0 Flamengo 3 -0.3
Madureira 1 Volta Redonda 1 -0.2
Boavista 0 Botafogo 1 +0.0
Points
Chance Will Win Championship