March 28, 2017

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a certain radioactive isotope has a half life of approx 1,300 years .
How many years to the nearest year would be required for a given amount of this isotope to decay to 55% of that amount.

So I am not sure where to put the 1,300


or A=x*e^1300

  • MATH help - ,

    300.00 5percent for 2 years

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