I need help with question 4 just give me a formula or steps on how to do it please

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

When an object is heated it contracts. a. true b. false

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?