Hi, I'm kind of lost with this question. It would be awesome, if sum1 can help me out. Thanks in advance!

Question: Bacteria population doubles in 20 hours. When was the population 1/8 of its present population?

I know we have to use logs but not sure where to start!

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Originally Posted by MathQuest2

Hi, I'm kinda lost with this question. It would be awesome, if sum1 can help me out. Thanks in advance!

Question: Bacteria population doubles in 20 hours. When was the population 1/8 of its present population?

I know we have to use logs but not sure where to start!

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If the bacteria doubles in 20 hours, then we can use that to find our constant of proportionately, k. If A is the initial amount, then 2A is the amount in 20 hours.







Now, since we have k, use it to find t when A is 1/8 the present population.