anonymous
  • anonymous
The amount of radioactive substance y that remains after t years is given by the equation y=ae^kt, where a is the initial amount present and k is the decay constant for the radioactive substance. If a = 100, y=50, and k=-0.035, find t so far i have... 50=100e^-0.035(t), then what?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
uhhhhhh?
anonymous
  • anonymous
no idea?
anonymous
  • anonymous
You set it up correctly, now just have to solve. Start by dividing both sides by 100.

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anonymous
  • anonymous
\[.5=e^-0.035(t)\]?
anonymous
  • anonymous
Yes. Now you need to get the t by itself. Think inverse of the e function...
anonymous
  • anonymous
uhmm..
anonymous
  • anonymous
i'm sorry i really have no idea. I get everything in the classroom and then when i get home and doing homework i get so lost.
anonymous
  • anonymous
Ok ln is the inverse of e. So if we take the ln of both sides we get ln(.5)=-.035t sorry for a later response...
anonymous
  • anonymous
thats okay.

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