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31-10-2019
Mathematics

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A radioactive substance decays according to

A radioactive substance decays according to class=

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ehigboriamarvelous01 ehigboriamarvelous01

31-10-2019

Answer:554.64 s

Step-by-step explanation:78/250= e^(-0.0021t)

0.312=e^(-0.0021t)

ln0.312= -0.0021t

t= 554.64 s

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