2. At what rate of interest, compounded continuously will an investment double in six years? 3. Plutonium-241 has a half-life of 13 years. A laboratory purchased 20 grams of the substance but had to wait five days before it could be used. How much of the substance was left after five days?

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Solve five of the following applications.
1. Dominic and Eva are given 10 Russian dwarf hamsters as a present. Given that the
hamsters reproduce at such a rate that their population doubles every 3 years, answer
the following:
(a) How many hamsters will they have in 6 years?
(b) Write an equation to represent the number of hamsters after t years.
(c) How long will it be until they have 100 hamsters and they must sell them back
to the pet store because there is no more room in the house? Round your answer
to the nearest year.
2. At what rate of interest, compounded continuously will an investment double in six
years?
3. Plutonium-241 has a half-life of 13 years. A laboratory purchased 20 grams of the
substance but had to wait five days before it could be used. How much of the substance
was left after five days?
4. Tritium is used in nuclear weapons to increase their power. It decays at the rate of
5.5% per year. Calculate the half-life of tritium.
5. Use the following model for the next two questions: The C(t) of a drug administered
to a patient intravenously jumps to its highest level almost immediately. The concen-
tration subsequently decays exponentially according to the law
C(t) = Coekt
where C(0) = Co. The physician administering the drug would like to have m <
C(t) < M, where m is the concentration below which the drug is ineffective and M is
the concentration above which the drug is dangerous.
(a) Suppose that immediately after a certain drug is administered, the concentration
is 5 milligrams per milliliter. Ten hours later the concentration drops to 1.5
milligrams per milliliter. Determine the value of k for this drug.
(b) The half-life of Valium is 36 hours. Suppose a patient receives 16 milligrams of
the drug at 8 A.M. How much Valium is in the patient's blood at 4P.M. the same
day?
Transcribed Image Text:Solve five of the following applications. 1. Dominic and Eva are given 10 Russian dwarf hamsters as a present. Given that the hamsters reproduce at such a rate that their population doubles every 3 years, answer the following: (a) How many hamsters will they have in 6 years? (b) Write an equation to represent the number of hamsters after t years. (c) How long will it be until they have 100 hamsters and they must sell them back to the pet store because there is no more room in the house? Round your answer to the nearest year. 2. At what rate of interest, compounded continuously will an investment double in six years? 3. Plutonium-241 has a half-life of 13 years. A laboratory purchased 20 grams of the substance but had to wait five days before it could be used. How much of the substance was left after five days? 4. Tritium is used in nuclear weapons to increase their power. It decays at the rate of 5.5% per year. Calculate the half-life of tritium. 5. Use the following model for the next two questions: The C(t) of a drug administered to a patient intravenously jumps to its highest level almost immediately. The concen- tration subsequently decays exponentially according to the law C(t) = Coekt where C(0) = Co. The physician administering the drug would like to have m < C(t) < M, where m is the concentration below which the drug is ineffective and M is the concentration above which the drug is dangerous. (a) Suppose that immediately after a certain drug is administered, the concentration is 5 milligrams per milliliter. Ten hours later the concentration drops to 1.5 milligrams per milliliter. Determine the value of k for this drug. (b) The half-life of Valium is 36 hours. Suppose a patient receives 16 milligrams of the drug at 8 A.M. How much Valium is in the patient's blood at 4P.M. the same day?
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