How do cells get energy they need to carry on activities?

Can someone explain to me how to do this problem ?

Argon is adiabatically compressed from an initial volume of 16 liters to a final volume of 2 liters. by what factor do the following quantities change? do they increase or decrease? (a) the rms speed (b) the thermal energy of the gas (c) the molar specific heat cv (d) the pressure

The pressure proportional to the area a- inversely b- directly c- increase d-decrease