A student is trying to determine the half-life of radioactive iodine-131. He measures the amount, A, of iodine-131 in a sample solution every 8 hours. His data are shown in the table.
(a) Find an appropriate exponential model of the data points.Amount at time t, A(t) =...........
(b) Find the half-life of idoine-131 according to the exponential model in part (a).
Half-life, t =.......