Math has not been my strong suit, so i have a little difficulty wraping my head around the concept of EV. When it comes to blackjack is where it gets confusing to me. I understand EV for a coin flip game is .5 for both heads or tails. When it comes in terms of bj game where is the EV either negative or positive coming from? Is it a constantly changing variable due to the hands that are dealt or can it be static based on the rules of the game? Is there a book that is recommended that will help me understand this more?