statistics question

Let the joint PDF of X and Y be: f (x, y) = 3x 76 X] , OSX52, OS/52 1. Find fx (x) (the marginal probability density function of X) , fy()) (the marginal probability density function of Y). 2. Find E(X) , E(Y) 3. Find Var(X) , Var(Y) 4. Find P (X > 1); P(Y > 1 /X > 1)