Let X₁ and X2 be any two random variables, then V(X₁1 + X2 ) must be: OA. greater than: V(X₁) + V(X2) OB. equal to V(X₁) + V(X2) OC. less than V(X1) + V(X2) OD. none of the above. QUESTION 2 Let X₁ and X₂ be any random variables, then E(X₁ + X2 + 10) must be A greater than: E(X₁) + E(X2) OB. greater than 10. OC. less than 10. OD. none of the above. QUESTION 3 In a typical equation of the linear model V(Y) must be: O.A.0. OB. V(u). OC. V(B1 + B2*X) OD. none of the above.