Statistics - Can anybody help me?

A Particular pain relieving medicine has a decay rate of 24% an hour. A patient was given a dose of the medicine 5 hours ago and there is currently 74mg of the medicine in the patients bloodstream.
Q: What was the Origional dose of the medicine? ________ milligrams.
Q How long will the patient need to wait for there to be less than 25% of the original dose of the medicine left in the bloodstream? _______hours. (to the nearest tenth of an hour)

  1. 0
  2. 0
  3. 26
asked by Cindy
  1. after t hours, starting with A mg, the amount remaining is

    A*.76^t

    So, to find the original dose, solve

    A*.76^5 = 74

    To get to 25%, you want

    .76^t = .25

    1. 0
    2. 0
    posted by Steve

Respond to this Question

First Name

Your Response

Similar Questions

  1. Statistics

    A Particular pain relieving medicine has a decay rate of 24% an hour. A patient was given a dose of the medicine 5 hours ago and there is currently 74mg of the medicine in the patients bloodstream. Q: What was the Origional dose

    asked by Cindy on March 13, 2015
  2. Pre Calc

    1)A particular pain relieving medicine has a decay rate of 10 % per hour. A patient was given a dose of the medicine 7 hours ago and there is currently 68 milligrams of the medicine in the patients bloodstream. 2)How long will the

    asked by Joe on October 20, 2017
  3. Calc

    A patient receives a 3 ml dose of medicine. The amount, y, of medicine in the body decreases at a rate of 15% per hour (dy/dt=-.15y). When the medicine in the patient is down to 1 ml, the nurse administers a second 3 ml dose and

    asked by Anon on May 11, 2014
  4. Algebra

    9. When doctors prescribe medicine, they must consider how much the drug’s effectiveness will decrease as time passes. If each hour a drug is 20% less effective as the previous hour, at some point the patient will not be

    asked by Daniela on July 14, 2015
  5. Making and Ad

    I need to come up with an ad for medicine, what could I do? Feeling weak, stomach pain, headache... Try our fast relieving pain Tynenol. Feel good wherever you go! What could be something better than what I have here? My ad seems

    asked by Teressa on October 22, 2010
  6. precalc

    Three hours after taking a pain medication, 41% of the medication still remains in the bloodstream. Let m be the 1-hour decay factor. a. What is the 3-hour decay factor as a numeric value? What is the 3-hour decay factor in terms

    asked by nikita on March 27, 2017
  7. algebra 2

    The label on a prescription bottle directs the patient to take the medicine twice a day. The effective ingredient of the medicine decreases continuously at a rate of 25% per hour. If a dose of medicine containing 1 milligram of

    asked by Dee on December 21, 2012
  8. Math

    When doctors prescribe medicine, they must consider how much the drug’s effectiveness will decrease as time passes. If each hour a drug is 20% less effective as the previous hour, at some point the patient will not be receiving

    asked by Daniela on July 14, 2015
  9. english

    which sentence contains a verb in the simple past tense? a.the patient complained of pain in the knee. b.the patient had complained of pain in the knee. c.the patient complains of pain in the knee. d.the patient will complain

    asked by bianca on February 20, 2013
  10. math

    After a dog or cat is given a preventive flea medicine, the medicine begins to break down in the animal’s bloodstream. With each passing hour, there is less active medicine in the blood. a. Complete the table and then draw a

    asked by Carly on April 16, 2018

More Similar Questions