How are these numbers calculated?

Big Games

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

Week of 3/11100.0*Seletiva100.0*Average seed
Botafogo 2 Madureira 1 -0.6
+0.1
Boavista 0 Fluminense 3 -0.2
Week of 3/19100.0*Seletiva100.0*Average seed
Botafogo 4 Portuguesa 1 Yes
-0.1
Madureira 0 Flamengo 2 -0.6
Bangu 2 Americano 0 -0.5
+0.0
Week of 3/23100.0*Seletiva100.0*Average seed
Portuguesa 2 Resende 1 +0.5
Americano 2 Botafogo 2 -0.1
Points
Chance Will Make Playoffs