How are these numbers calculated?

Big Games

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

Week of 10/4100.0*Chance in playoffs100.0*Average seed
Red Bulls 2 Galaxy 0 -7.1
-0.2
Sounders 0 Union 2 -1.4
Week of 10/12100.0*Chance in playoffs100.0*Average seed
Timbers 0 Dynamo 2 -24.3
-0.7
Sporting KC 2 Red Bulls 0 +5.1
+0.1
New England 0 Crew 3 -2.9
-0.1
Whitecaps 2 DC United 1 +2.3
+0.1
DC United 1 Fire 2 +0.8
+0.0
Fire 1 FC Dallas 2 -0.3
+0.1
Rapids 0 Real Salt Lake 0 -0.2
-0.0
Galaxy 1 Chivas USA 0 +0.1
Sounders 2 Earthquakes 1 +0.0
Week of 10/19100.0*Chance in playoffs100.0*Average seed
Red Bulls 1 Union 0 Out
-0.1
DC United 1 Timbers 1 -5.8
+0.0
Fire 3 Crew 2 -0.5
DC United 0 Sporting KC 1 +0.2
Real Salt Lake 1 Timbers 1 -0.2
Points
Chance Will Make Playoffs