A Patient Is Given an Injection of 21 Units of a Certain

question 18

Multiple Choice

A patient is given an injection of 21 units of a certain drug every 24 hours.The drug is eliminated exponentially so that the fraction that remains in the patient's body after t days is $f ( t ) = e ^ { - t / 5 }$ If the treatment is continued indefinitely,approximately how many units of the drug will eventually be in the patient's body just prior to an injection?

• A)94.85 units
• B)46.65 units
• C)115.85 units
• D)141.50 units

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