If the half-life of iodine-131 is 8 days, how old is a sample if only 1/8 of the original amount remains? write 2-3 sentences explaining your answer.

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?