An initial sample of 257 g of a radioactive substance decays according to the function $A(t) = 257e^{-0.015t}$ where $t$ is given in years. (a) How many grams of the substance will remain after 78 years? Round your answer to one decimal place.
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The function is A(t) = 257e^(-0.015t) and we need to find the amount remaining after 78 years. Show more…
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