Question

A mixture of gasoline vapor and air is placed in an engine cylinder. The piston has an area of 7.4*10^-3 m^2 and is displaced inward by 7.2*10^-2 m. If 9.5*10^5 Pa of pressure is placed on the piston, how much work is done during this process? Is work being done on or by the gas mixture?


I don't get this at all.

Pressure*Volume= work

Work is being done on the gas mixture: it is being compressed.