How are these numbers calculated?

Big Games

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

Week of 3/3100.0*Seletiva100.0*Average seed
Bangu 1 Portuguesa 1 +0.1
Week of 3/7100.0*Seletiva100.0*Average seed
Volta Redonda 1 Botafogo 1 -9.4
+0.1
Fluminense 2 Nova Iguacu 1 -6.6
+0.1
Macae 1 Volta Redonda 1 +5.4
-0.2
Portuguesa 2 Nova Iguacu 1 -2.9
+0.1
Madureira 0 Cabofriense 2 -1.9
+0.1
Week of 3/17100.0*Seletiva100.0*Average seed
Nova Iguacu 0 Macae 2 -32.6
+0.3
Volta Redonda 2 Boavista 3 Yes
-0.3
Bangu 0 Madureira 3 +20.3
-0.5
Points
Chance Will Make Playoffs