How are these numbers calculated?

Big Games

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

Week of 11/15100.0*Serie C100.0*Average seed
Icasa 2 Paysandu 1 +21.2
-0.8
ABC 4 ASA 1 +7.7
-0.2
America-MG 3 Atletico-GO 0 -4.1
+0.2
Guaratingueta 0 Ceara 1 -3.4
+0.1
Avai 0 America-RN 1 +2.8
-0.1
Chapecoense 1 Bragantino 1 +0.4
+0.0
Week of 11/22100.0*Serie C100.0*Average seed
Paysandu 0 Bragantino 1 +18.9
-0.6
Guaratingueta 3 Parana 4 -8.1
+0.2
Oeste 2 Atletico-GO 4 +5.1
-0.2
ABC 1 Avai 0 +2.1
-0.1
Sao Caetano 2 America-RN 2 +0.1
+0.0
Week of 11/29100.0*Serie C100.0*Average seed
Atletico-GO 2 Guaratingueta 0 Yes
Sport Recife 0 Paysandu 0 Yes
-0.4
ASA 1 Sao Caetano 0 +0.1
Points
Chance Will Win Championship