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6. (15 points) The radioactive substance Bismuth-210 has a half life of 5 days. (a) A sample originally has a mass of 800 mg.

6. (15 points) The radioactive substance Bismuth-210 has a half life of 5 days. (a) A sample originally has a mass of 800 mg. Find a formula for the mass remaining after days. (b) Find the mass remaining after 30 days. (c) When is the mass reduced to 10 mg.

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