A laboratory has a 30-gram sample of radon-222, which decays at a rate of 16.6% per day.
a. Find a natural growth model R(t) that gives the amount of radon-222 as a function of t, time in days.
b. How long does it lake for the sample to decay to 5 grams?
c. Flow much radon-222 remains after 2 weeks?
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