Radioactive substances decay exponentially over time, giving off energy and becoming a different substance. The amount of time required for half of a radioactive substance to decay is called the half-life of the substance. 60 The amount A, in grams, of a radioactive substance is given by A (t) = 250 (¹) where t is the number of days since the sample was produced in the lab. Use this exponential function to complete the following statements. There were first produced (t=0). grams of the radioactive substance when the sample was The half-life of the radioactive substance is days.

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