How are these numbers calculated?

Big Games

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

Week of 4/25100.0*Relegated100.0*Average seed
Northampton 2 Hereford 1 -19.0
+1.1
Northampton 0 Milton Keynes 1 +16.2
-0.9
Cheltenham 1 Carlisle 1 -1.6
+0.1
Swindon 2 Bristol Rovers 1 +1.0
-0.2
Hartlepool 0 Leeds 1 -0.4
+0.2
Tranmere 1 Yeovil 1 +0.1
+0.0
Huddersfield 2 Brighton 2 +0.1
Week of 5/2100.0*Relegated100.0*Average seed
Carlisle 2 Millwall 0 +14.7
-0.2
Leeds 3 Northampton 0 +14.7
-1.2
Brighton 1 Stockport 0 +5.3
-0.3
Scunthorpe 1 Tranmere 1 +0.1
Bristol Rovers 4 Hartlepool 1 +0.3
Yeovil 0 Colchester 2 +0.1
Peterborough 2 Swindon 2 -0.1
Points
Chance Will Win Championship