Iodine-131 is an isotope that is used to study the functioning of thyroid glad. This isotope has a half life (time required for half the material to erode) of approximately 6 days. If a patient is given an injection that contains 18 micrograms of iodine -131, what will be the iodine level in the patient after 8 days? [answer] micrograms. Use the function A(t) =18(1/2)^t/6 where A is the amount of the isotope in micrograms in the patients after t days. Round to the nearest tenth