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Mathematics, 25.04.2020 00:54 jessica28757

A radioactive isotope decays exponentially at a rate of 0.0111% each year.
How long will it take 500 g of the isotope to decay to 150 g? Round your answer to the nearest whole
number.
I got 120 but it says that it is wrong, can someone explain this problem to me?

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A radioactive isotope decays exponentially at a rate of 0.0111% each year.
How long will it ta...
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