## College Algebra 7th Edition

Published by Brooks Cole

# Chapter 4, Exponential and Logarithmic Functions - Section 4.2 - The Natural Exponential Function - 4.2 Exercises - Page 378: 23

#### Answer

$D(3)\approx 27.4$ milligrams.

#### Work Step by Step

We are given: $D(t)=50e^{-0.2t}$ To find the amount of the drug left, we plug in $t=3$ hours: $D(3)=50e^{-0.2*3}\approx 27.4$ milligrams.

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