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 =.......

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Time (h) 0 8 16 24 32 40 48 Amount (g) 8.64 8.32 8.18 782 7.7 742 7.22 09