How are these numbers calculated?

Big Games

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

Week of 1/5100.0*Relegated100.0*Average seed
Central Coast 0 New Zealand 0 Yes
Sydney 0 New Zealand 1 -5.1
Perth 2 Melbourne 2 +0.8
Week of 1/12None
Week of 1/19None
Chance Will Make Playoffs