Question

The formula $$ D=5 e^{-0.4 h} $$ can be used to find the number of milligrams $D$ of a certain drug that is in a patient's bloodstream $h$ hours after the drug was administered. When the number of milligrams reaches 2 , the drug is to be administered again. What is the time between injections?

          The formula
$$
D=5 e^{-0.4 h}
$$
can be used to find the number of milligrams $D$ of a certain drug that is in a patient's bloodstream $h$ hours after the drug was administered. When the number of milligrams reaches 2 , the drug is to be administered again. What is the time between injections?

Added by Thomas L.

Precalculus with Limits

Ron Larson 2nd Edition

Instant Answer

Solved by Expert Cinsy Krehbiel

07/13/2020

Step 1

We are given the formula for the drug concentration in the bloodstream: $D = 5e^{-0.4h}$. Show more…

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The formula $$ D=5 e^{-0.4 h} $$ can be used to find the number of milligrams $D$ of a certain drug that is in a patient's bloodstream $h$ hours after the drug was administered. When the number of milligrams reaches 2 , the drug is to be administered again. What is the time between injections?