How are these numbers calculated?

Big Games

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

Week of 5/23None
Week of 5/24100.0*Average seed
Botafogo 0 Bragantino 2 -0.2
Nautico 1 Vasco da Gama 1 +0.1
Week of 5/31100.0*Average seed
Guarani 2 Botafogo 1 -0.3
Vasco da Gama 0 Santos 0 -0.1
Games Above .500
Chance Will Make Playoffs