Let X, Y, and Z be random variables, and let Cov(⋅,⋅) denote the covariance operator as usual. 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.
a. Cov(TY,7X)=_______
b. Cov(7X +6,Z)=________
c. Cov(7Y,7X +7Z)=______
d. Cov(7X +6Y,7X+7Z)=_______

Mathematics

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