Could you please edit your post with a screen shot instead of a photo taken with your phone. Please use Alt+PrtSc so that the shot is only of the event page, not your whole desktop. It will make the information a lot, lot easier to read.
Discovering math. functions for damage formulas was one of the greatest things for me.
It's very useful for balancing skills to work in a variety of possible circumstances.
For example if you have a skill that is supposed to work for both mages and warriors: