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 -5.6
+0.0
Boavista 0 Fluminense 3 -0.2
+0.0
Week of 3/19100.0*Seletiva100.0*Average seed
Bangu 2 Americano 0 +13.2
-0.2
Madureira 0 Flamengo 2 -4.9
+0.1
Botafogo 4 Portuguesa 1 -0.5
+0.1
Week of 3/23100.0*Seletiva100.0*Average seed
Madureira 0 Cabofriense 0 +0.8
-0.0
Americano 2 Botafogo 2 +0.4
+0.1
Portuguesa 2 Resende 1 -0.5
Points
Chance Will Make Playoffs