Okay motocross fans… We’ve been struggling with the recent “numbers hung” (that’s professional gambling talk for odds) for this weekend’s Rockstar U.S. Open of Supercross over in the town we’ve all come to know and love: Las Vegas. To help get our heads wrapped around these mathematics (I’m a great example as it took everything I had to get through my business statistics class in college), we rang up Jay Rood, Race and Sports Book Director of the MGM MIRAGE in Las Vegas. A great guy, I had to slow him down a few times to make sure I was comprehending what he was telling me. So to that end…