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E[X]=3, E[Y]=4, Var[X]=16, Var[Y]=9 and P(x,y)=-0.3 a) Var(2X-3Y)=? b) Cov(3X-3, 4Y+7)=?

E[X]=3, E[Y]=4, Var[X]=16, Var[Y]=9 and P(x,y)=-0.3 a) Var(2X-3Y)=?

b) Cov(3X-3, 4Y+7)=?

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