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if a bacteria population triples every three hours, how long will it take a population of 20 colonies to grow to 1,000?

Algebra
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I'm going over practice problems during break and I am stumped on this one. Forgot how to do exponential...The answer in my book says 10.683 hours.
Thank god its practice, il still try to figure it out
yeah i know! but out of everything I am reviewing I am totally missing something here...I'm pretty sure I need to find the rate and then just plug that into the log.

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Other answers:

yeah
Are you familiar with the exponential growth equation \[N = N _{0} e ^{kt}\]
yes
Well, we know N0 is the initial population. N0 = 20. This corresponds to time t = 0. We also know that the population, N, triples every three hours. Thus when t = 3, N = 60. Plug these numbers in and solve for k. Then you will have a general equation.
awwwwwwww, yes! thank you. i have been refreshed.

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