Iodine Decay The amount of iodine 131 remaining in a sample that originall...

Iodine Decay The amount of iodine 131 remaining in a sample that originally contained A grams is approximately

where t is time in days.

a. Find, to the nearest whole number, the percentage of iodine 131 left in an originally pure sample after 2 days, 4 days, and 6 days.

b. Use a graph to estimate, to the nearest day, when one half of a sample of 100 g will have decayed.