Suppose that X, Y and Z are jointly distributed random variables, that is, they are defined on the same sample space. Suppose also that E(X)=-2 E(Y) = - 8 E(Z)=- 4 Var(X) = 34 Var(Y) = 26 Var(z)=4. Compute the values of the expressions below E(2-2Z) = E(2Z + 3Y/5) = var(-4Y) + 2 = E(-Z^2) =