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Radioactive Decay

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Radioactive Decay
Iodine 131 is a radioactive material that decays according to the function A(t) = A
where A0 is the initial amount present and A is the amount present at time t (in days). Assume that a scientist has a sample of 100 grams of iodine 131.
a. What is the decay rate of iodine 131?
b. Graph the function using a graphing utility.
c. How much iodine 131 is left after 9 days?
d. When will 70 grams of iodine 131 be left?
e. What is the half-life of iodine 131?

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