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Bismuth-210 has a half-life of 5 days. A sample originally has a mass of 160mg a)...

Bismuth-210 has a half-life of 5 days. A sample originally has a mass of 160mg

a) Find a formula for the mass remaining after t days

b) Find a mass remaining after 20 days.

c) When is the mass reduced to 1 mg? You may leave your answer in terms of logarithms

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