anonymous
  • anonymous
You go to the doctor and he gives you 13 milligrams of radioactive dye. After 24 minutes, 4.25 milligrams of dye remain in your system. To leave the doctor's office, you must pass through a radiation detector without sounding the alarm. If the detector will sound the alarm if more than 2 milligrams of the dye are in your system, how long will your visit to the doctor take, assuming you were given the dye as soon as you arrived? Give your answer to the nearest minute. You will spend ? minutes at the doctor's office.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
56 min.
anonymous
  • anonymous
how? did you get it?
anonymous
  • anonymous
please:)

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amistre64
  • amistre64
pert might help
anonymous
  • anonymous
ok:)
amistre64
  • amistre64
4.25 = 13(e^24t)
amistre64
  • amistre64
4.25/13 = e^24t ln(4.25/13) = 24t ln(4.25/13) ---------- = t 24
amistre64
  • amistre64
umm... t = rate lol
amistre64
  • amistre64
we use the rate to determine when 2 is the answer
amistre64
  • amistre64
2 = 13(e^rate(time))
amistre64
  • amistre64
time then equals: ln(2/13) ------- = minimum time in office rate
anonymous
  • anonymous
ok i see...:) hopefully i can get the next story prob right:) i have 17 of them:(
amistre64
  • amistre64
http://www.wolframalpha.com/input/?i=%28ln%282%2F13%29%29%2F%28ln%284.25%2F13%29%2F24%29 says 40.18 minutes
anonymous
  • anonymous
someone told me about this!:O! thanks!!
anonymous
  • anonymous
the website i mean haha
amistre64
  • amistre64
yeah, i just stumbled upon it one day while cleaning behind the fridge lol
anonymous
  • anonymous
lol

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