a) A bottle of I-131 is delivered to a hospital on September 5. It states on the label that the radioactivity at 12:00 p.m. on September 10 will be 380 megabecquerels (MBq). i) Write a defining equation for the relationship between the amount of radioactivity and the time since the bottle was delivered. ii) What is the radioactive activity at • 12:00 p.m. on the delivery day? • 6:00 a.m. on September 25? iii) Sketch the graph of this relationship.

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