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The half life of an atom is 30 years, suppose we have a sample which weights 170g. Find the function w(t) which gives the mass

The half life of an atom is 30 years, suppose we have a sample which weights 170g. Find the function w(t) which gives the mass remaining after t years, and enter into w. How much of the sample remains after 140 years, rounded to 2 decimal places. After how many years will only 1g remain, rounded to 1 decimal place.

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