let x and y be two random variables such that E(x)=5, var(x)=2,E(y)=5,E(x*y)=7,var(x+y)=4 find cov(x,y) and var((x-y)
213529520041651859766
1999742
137817.7407
24543491
4608849.2044
4.85358240282922120
1.99059895224465720
2.59247344507387821...
(−3ab + 2a) + (−1+10ab−5a)− (8a + 11ab − 3) + 11a
0.15 $\sqrt{3060}$
173261715851991473930
1597248
129763.7732
21147259
3939668.7981
2.29860289235303620
8.02323700176847219
1.16820017412150821...
3.83
6*4^x-13*6^x+6*9^x=13*6
