anonymous
  • anonymous
A 15 gram sample of radioactive iodine decays in such a way that the mass remaining after t days is given by m(t)=15e^(-0.087t), where m(t) is measures in grams. After how many days is there only 8 grams remaining?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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amistre64
  • amistre64
8 --- = e^(-.087t) 15 8 ln(---) = -.087t 15 ln(8/15) ------- = t -.087
amistre64
  • amistre64
t = 7.225....
amistre64
  • amistre64
dbl chk and we get: m(t) = 7.999999....

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anonymous
  • anonymous
Yayyyy! Thanks again :)
amistre64
  • amistre64
youre welcome :)

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