Question

A radioactive isotope has a half-life of 9 hours. find the amount of the isotope left from a 360-milligram sample after 36 hours. if necessary, round your answer to the nearest thousandth.

Answer 1

22.5 mg

Step-by-step explanation:

36 hrs / 9 hr/half life = 4 half lives

(1/2)^4 * 360 = 22.5 mg