Question: Suppose that X and Y are random variables such that Var(X) = 9, Var(Y) = 4, and (X, Y) =1/6. Determine (a) Var(X + Y)

Suppose that X and Y are random variables such that Var(X) = 9, Var(Y) = 4, and ρ(X, Y) =−1/6. Determine
(a) Var(X + Y)
(b) Var(X − 3Y + 4).

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