The decay of 431 mg of an isotope is given by A(t)- 431 0 0121, where t is time in years since the initial amount
The decay of 431 mg of an isotope is given by A(t)- 431 0 0121, where t is time in years since the initial amount of 431 mg was present. Find the amount (to the nearest milligram) left after 85 years. O A) 78 O B) 426 O c) 155 OD) 154
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