Please show numerical calculations

5) X and Y are two random variables with the following joint probability mass function: p(x,y) = rty 30 for X= 0,1,2,3 and Y = 0,1,2 p(x,y) = 0 otherwise a) What is the marginal function of X? b) Are X and Y independent? c) Find E(2X2 - 4X + 5) d) Find V(10 - 5X)