The amount of a radioactive material changes with time. The table below shows the amount of radioactive material f (t) left after time t: t (hours) 0 1 2 f (t) 180 90 45 Which exponential function best represents the relationship between f (t) and t? f (t) = 0.5 (180) t f (t) = 180 (0.25) t f (t) = 180 (0.5) t f (t) = 0.5 (50) t

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13 February, 00:52

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Chasity Vargas · Answer 1

Your answer is f (t) = 180 (0.5) ^t This is because the number is cut in half for every hour.