How are these numbers calculated?

Big Games

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

Week of 9/21100.0*Chance in playoffs100.0*Average seed
DC United 2 Seattle 0 -0.5
-0.5
San Jose 1 Philadelphia 2 +0.4
+0.1
FC Dallas 1 NYCFC 1 +0.3
+0.0
Portland 2 New England 2 +0.3
+0.1
LA Galaxy 2 Montreal 1 -0.2
-0.1
Atlanta 3 San Jose 1 +0.2
+0.1
Portland 0 Minnesota 0 +0.1
+0.1
RSL 1 LA Galaxy 2 -0.0
New England 0 RSL 0 +0.0
Minnesota 2 Sporting KC 1 -0.1
Week of 9/29100.0*Chance in playoffs100.0*Average seed
San Jose 0 Seattle 1 +0.9
LA Galaxy 3 Vancouver 4 +0.3
RSL 2 Houston 1 -0.1
Colorado 3 FC Dallas 0 +0.1
Sporting KC 2 Portland 2 +0.1
Minnesota 1 LAFC 1 -0.0
Week of 10/6100.0*Chance in playoffs100.0*Average seed
Seattle 1 Minnesota 0 +0.8
Vancouver 0 RSL 1 -0.2
Houston 4 LA Galaxy 2 +0.2
Points
Chance Will Make Playoffs