9. A particular radioactive substance has a half-life of 3 years. Suppose an initial sample has a mass of 200 mg.
a) Write an equation that relates the mass of the radioactive material remaining to time.
b) How much will remain after one decade, to the nearest hundredth?
please do part b)

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Af = Ao (1/2) ^ t/h

Af = 200 (1/2) ^ 10/3
i cant solve from here

punch it in the calculator.
i got 0.07; to the nearest hundredth

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