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The pressure and volume of the gas in state A are p_A and V_A respectively. The pressure and volume of the gas in state C are p_C and V_C respectively.

http://session.masteringphysics.com/problemAsset/1011140/12/STH_tc_2.jpg

Part C

What is DeltaU, the change in the gas's internal energy after a complete cycle?

Express your answer in terms of any needed variables from the problem introduction.

Okay I know that Q is zero, and deltaU = Q - W, so deltaU = -W, and W = p*deltaV, and a complete cycle means it returns to its original state.

So my answer should be p_A*V_A, but it's incorrect, it says the answer does not depend on those variables, what variables are they looking for then?

Help?