Let X, Y, and Z be random variables. Suppose that the variance of X is 0.7, Cov(X,Y) = 0.4, Cov(X,Z) = 1.2, and Cov(Y,Z) = 0.8. Find each of the following to two decimal places (if applicable).(a) Cov(2 Y, 3 X +1) (b) Cov(2 X + Y, 3 X + 2 Z)