Work from a slow hydraulic piston stroke

A frictionless piston of cross-sectional area $0.018\,\mathrm{m^2}$ moves outward by $0.120\,\mathrm{m}$ against a constant external absolute pressure of $145\,\mathrm{kPa}$. The gas internal energy rises by $2.70\,\mathrm{kJ}$. Calculate the increase in cylinder volume, boundary work done by the gas, and the heat supplied.