help!!!

please help me with this question: it mechanical engineering.. i dont understand

a mass of 0.13kg air inside a piston cylinder assembly is subjected to the following cycles of processes (a) adiabetic compression from initial condition of 1.43bar and 0.95 m^3, until half of the initial volume (b) polytropic expansion according to the law pv^1.30=c, to the initial volume and (c) a constant- volume heat transfer returning to the fluid to the initial state. sketch the p-v diagram and determine

(a) the work done by the air for each process

(b) the heat transfer for each process

(c) the change in internal energy for each process

please help me out..