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Posted by on Sunday, June 14, 2009 at 11:43am.

The formula N = 10(4') gives N, the number of bacteria present in a culture after t hours. How many hours
does it take for the number of bacteria to grow to 2,560?

a. 2 hours
b. 3 hours
c. 4 hours
d. 5 hours

The answer is c., but is there another way to find this answer besides substituting?

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