Hey guys, Im going over my Econometrics homework () and was hoping for some help to confirm or correct my answers. Its regarding the basic properties of Variance and Expected Value. Any help is much appreciated. Here's what I got so far (my answers in italicized font):

1) Calculate E(X + Y) =muX + muY2) Calculate V(X + Y) =

sigmaX + sigmaY + 2sigmaXY3) Calculate E(2X) =

2muX4) Calculate E(2Y) =

???5) Calculate V(2X + 3Y) =

4sigmaX + 9sigmaY + 12sigmaXY6) Calculate E(1 + 2X) =

2muX + 17) Calculate V(1 + 2X) =

4sigmaX8) Calculate E(3X + 4(Y + 1)) =

3muX + 4muY + 49) Calculate V(3X + 4(Y + 1)) =

9sigmaX + 16sigmaY10) Calculate E(aX + b(Y + c)) =

amuX + bmuY + bc11) Calculate V(aX + b(Y + c)) =

a^2sigmaX + b^2sigmaY