5700 J of heat are added to a system. It does 3800 J of work on the surroundings. What is ΔE in J?

a) ΔE = Q - W = 5700 - 3800
b) ΔE = Q + W = 5700 + 3800
c) ΔE = Q × W = 5700 × 3800
d) ΔE = Q / W = 5700 / 3800