2 part question that I'm struggling with; please help!  Radioactive materials are often used in biological studies. A radiation biologist studies the rate of decomposition of a certain substance and obtains the following data: Time (days) 0 4.0 8.0 12.0 16.0 Mass (μg) 27.90 21.09 15.94 12.04 9.10 Determine the rate constant in units of days-1. How many micrograms will remain after 29 days?

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