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 +21.4
-0.7
Boavista 0 Fluminense 3 -1.8
+0.1
Week of 3/19100.0*Seletiva100.0*Average seed
Madureira 0 Flamengo 2 +20.6
-0.6
Bangu 2 Americano 0 -17.0
+0.2
Botafogo 4 Portuguesa 1 -8.3
+0.1
Week of 3/23100.0*Seletiva100.0*Average seed
Americano 2 Botafogo 2 -11.0
+0.1
Madureira 0 Cabofriense 0 +10.5
-0.1
Points
Chance Will Make Playoffs