Exponential model word problem: medication dissolve | High School Math | Khan Academy

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Sal solves an exponential equation in order to answer a question about an exponential model.

High School Math on Khan Academy: Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it.

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At 1:40, just convert the equation into logarithm (ln e 0.05 = -0.8*t) and solve it algebraically. Much more easier and faster.

duckthishandle
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Is the e in the equation the number e, 2.71?

mauricevolaski