C = 0.1 + 2.78e^-0.39t milligrams per gallon How do you find the concentration after 2 hours? I know to plug in the 2 for t but I never get the correct answer.

Intermediate Algebra
19th Edition
ISBN:9780998625720
Author:Lynn Marecek
Publisher:Lynn Marecek
Chapter10: Exponential And Logarithmic Functions
Section10.2: Evaluate And Graph Exponential Functions
Problem 10.33TI: Another researcher at the Center for Disease Control and Prevention, Lisa, is studying the growth of...
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C = 0.1 + 2.78e^-0.39t milligrams per gallon

How do you find the concentration after 2 hours? I know to plug in the 2 for t but I never get the correct answer.

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