How are these numbers calculated?

Big Games

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

Week of 4/13100.0*Relegated100.0*Average seed
Willem II 3 Feyenoord 1 +3.9
-0.1
Heracles 0 NAC Breda 1 +3.3
-0.5
Sparta 4 Heerenveen 2 +1.4
-0.3
Roda JC 4 VVV Venlo 1 -0.5
De Graafschap 1 FC Utrecht 1 +0.5
+0.0
FC Groningen 1 Ajax 2 +0.1
Week of 4/20100.0*Relegated100.0*Average seed
Twente 2 Willem II 0 No
+0.3
Ajax 5 Heracles 1 +6.1
-0.2
VVV Venlo 3 De Graafschap 0 -1.6
+0.1
AZ Alkmaar 1 Sparta 0 -0.2
Points
Chance Will Win Championship