Question 578197: Given a starting population of 100 bacteria, the formula b=100(2^t) can be used to find the number of bacteria, "b", after "t" periods of time. If each period is 15 minutes long, how many minutes will it take for the population of bacteria to reach 51,200?
i already know the answer is 135...but how do you get that?
Found 2 solutions by dfrazzetto, josmiceli:
Answer by dfrazzetto(277)   (Show Source):
You can put this solution on YOUR website!
b=100(2^t)
51,200 = 100 (2^t)
512 = 2^t
**take the log(base 2) of both sides
log(512) = log (2^t)
9 = t
so 9 'periods' of time, to get minutes:
minutes = 15t = 15 x 9 = 135 minutes
Answer by josmiceli(9697)  (Show Source):
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