Suppose X and Y are independent variables such that E[X] = 2, E[Y] = 3, E[X^2] = 9 and E[Y^2] = 15. Find  E[8X - 4Y] Var(8X - 4Y)

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Chapter1: Combinatorial Analysis
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Suppose X and Y are independent variables such that E[X] = 2, E[Y] = 3, E[X^2] = 9 and E[Y^2] = 15.

Find 

E[8X - 4Y]

Var(8X - 4Y)

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