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An accident at a nuclear power plant has left the surrounding area polluted with radioactive material...

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 48 su(safe units), and 5 months later it is still 28 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 will it be until A=1 su, so it is safe for people to return to the area?

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