Let W and Z be random variables such that the variance of W is 8 , the variance of Z. is 4 , and the covariance of W with Z is 2 . Find the variance of 2W+37. 4(8)+6(2)+9(4) 2(8)+6(2)+9(4) 4(8)+12(2)+9(4) 2(8)+6(2)+3(4)