When a system goes from state A to state...

When a system goes from state A to state B, it is supplied with 400 J of heat and it does 100 J of work.
(a) For this transition, what is the system's change in internal energy?
(b) If the system moves from B to A, what is the change in internal energy?
(c) If in moving from A to B along a different path in which `W_(AB)^'=400J` of work is done on the system, how much heat does it absorb?

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