How are these numbers calculated?

Big Games

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

Week of 3/3None
Week of 3/7100.0*Seletiva100.0*Average seed
Madureira 0 Cabofriense 2 +22.4
-0.7
Macae 1 Volta Redonda 1 -6.1
+0.1
Portuguesa 2 Nova Iguacu 1 -3.2
+0.1
Fluminense 2 Nova Iguacu 1 -1.2
+0.0
Volta Redonda 1 Botafogo 1 +0.1
Week of 3/17100.0*Seletiva100.0*Average seed
Bangu 0 Madureira 3 -29.9
+1.0
Volta Redonda 2 Boavista 3 No
+0.3
Nova Iguacu 0 Macae 2 -3.2
+0.1
Points
Chance Will Make Playoffs