a). If work is done by a system, heat is added to a system, and the internal energy of the system is lower in the final state than the initial state, what are the signs of w, q, and E for the system?

b). Calculate the change in internal energy, E, when 2.17 moles of a diatomic ideal gas is cooled from an initial temperature of 457 C to a final temperature of 145 C. Give your answer in joules (J).