An accident at a nuclear power plant has left the surrounding area polluted with radioactive material that decays naturally. The initial amount of radioactive material present is 15 su (safe units), and 5 months later it is still 10 su.
(a) Write a formula giving the amount A (t ) of radioactive material (in su) remaining after t months.
(b) What amount of radioactive material will remain after 8 months?
(c) How long—total number of months or fraction thereof will it be until
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