Please solve both steps in the picture

Air is compressed in a piston-cylinder assembly from p1=25lbf/in2,T1=500R,V1=4ft3 to a final volume of V2=1ft3 in a process described by pv1.25= constant. Assume ideal gas behavior and neglect kinetic and potential energy effects. Using constant specific heats evaluated at T1, determine the work and the heat transfer, in Btu. Step 1 Determine the work, in Btu. W12= Btu Step 2 Determine the heat transfer, in Btu. Q12= Btu