Can I please get an legible explanation of this problem showing where all numbers come from and what equations are used. Thank you.

An adibatic capillary tube (AKA throttle valve) is used in some refrigeration systems to drop the pressure of the refrigerant from the condenser level to the evaporator level. The R-134A enters the capillary tube as a saturated liquid at 50 degrees C and leaves at -21 degrees C. Determine the quality of the refrigerant at the inlet of the evaporator. Use data from the tables.