How are these numbers calculated?

Big Games

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

Week of 10/12100.0*Chance in playoffs100.0*Supporters Shield100.0*Average seed
Galaxy 1 Impact 0 -14.5
No
-0.7
Impact 0 New England 1 -10.0
-2.9
-0.7
FC Dallas 2 Fire 3 -2.9
-0.1
DC United 1 Union 1 +0.5
+0.1
Timbers 1 Sounders 0 -0.1
Week of 10/19100.0*Chance in playoffs100.0*Supporters Shield100.0*Average seed
Impact 2 Union 1 +34.9
+1.2
New England 3 Crew 2 -5.9
-0.2
Fire 1 Toronto FC 0 -5.8
-0.2
Dynamo 0 Red Bulls 3 +3.8
+0.2
Week of 10/26100.0*Chance in playoffs100.0*Supporters Shield100.0*Average seed
DC United 1 Dynamo 2 -17.9
-0.6
Crew 0 New England 1 -17.9
-0.6
Red Bulls 5 Fire 2 +5.5
+0.4
Toronto FC 1 Impact 0 -4.5
-0.6
Points
Chance Will Make Playoffs