i think, best case scenario for Everton would be beating Watford, Palace & Brentford, losing to Chelsea, Leicester, Arsenal.
So 9 points, best case scenario, taking them to 38 points.
So Leeds & Burnley need 2 wins in their last 4 to be safe, 100% i think, on 39 points.
I admit though, that the safety line will probably be lower than 39.