Decay of radioactive materials can be modeled by the equation A = A0ekt, where A is the amount at time t, A0 is the amount at t = 0, and k is the decay constant ( k < 0 ). Iodine-132 is a radioisotope that is used in thyroid function tests. Its half-life time is 13.3 hours. Calculate the relative amount of lodine - 132 (A/A0) in a patient's body 48 hours after receiving a dose. After determining the value of k, define a vector t = 0, 4, 8, ... , 48 and calculate the corresponding values of A/A0.