Expontenial function question please help me! Iodine-131 is a radioactive isotope used in the treatment of thyroid conditions.It has a half-life of 8 days/ hsalf life is the amount of daysfor half of the substance to decay. If a patient is iven 20mgof iondine131 how much of the substance will remain in his body after 32 days?
a.8mg
b.5mg
c.2.5mg
d.1.25mg

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