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An initial sample of 171 g of a radioactive substance decays according to the function
A(t) = 171e ^ - 0.04(t) where t is given in years?

a) How many grams of the substance will remain after 59 years? Round your answer to the nearest decimal place.

b) What is the half-life of the substance? Round answer to the one decimal place.

Sagot :

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