What is the formula for these objects + Should Webber move to Ferrari?

Leaving aside the early part of your q. No. At least not unless Alonso goes. With Alonso there, Ferrari are not going to give Webber any more 'chances' as he currently gets with RB. It might be okay if Alo goes, but I'd not count on it because I believe Webber is coming to the end of his run in F1.