The radioactive element potassium-42 is often used in biological experiments. If we start with 6grams of potassium-42, there is 1.7 grams left in 22.5 hours.

1. Write function in the form ofA=A0ektthat expresses the amount of potassium-42 as a function of time. Do not round until the final answer. Then roundkto four decimal places.
2. Use your function in a to find the half-life of potassium-42. Do not round until the final answer. Round the final answer to two decimal places and write out units.