A system is taken through the three processes in the figure. P a b V Q = 110 and W = 30 for path i to a to f, and Q = 120 for path i to b to f. (All units are in Joules.) a) What is the change in internal energy for the process i to a to f? b) What is W for the process i to b to f? C) What is the change in internal energy for the process i to f along the curved path ? d) If the change in internal energy is 30 for the path i to b, what is Q for the process b to f