what is the mass of a in the cylinder if the cross sectional area has 0.4cm square and the vertical length of the liquid is 2cm and density of mercury is 13.6g/cm​

If you visited mount shasta city (elevation 900 m [3000 ft.]) and found the outside air temperature to be 27°c (81°f), what would be the air temperature at the summit of mount shasta (elevation 4200 m [14,000 ft.]) at that moment-assuming that the temperature conditions with altitude change at an average, or normal, lapse rate?