Asked by Kris
I need some help.
A biologist finds that the population of a certian type of bacteria double seach half-hour. An initial culture has 60 bacteria.
1. What is the population after 3 hours?
2. How long will it take for the number of bacteria to reach 983,040?
A biologist finds that the population of a certian type of bacteria double seach half-hour. An initial culture has 60 bacteria.
1. What is the population after 3 hours?
2. How long will it take for the number of bacteria to reach 983,040?
Answers
Answered by
Reiny
let number = 60 (2)^(2t) , where t is in hours
when t = 3
number = 60 (2)^6 = 3840
2. we would be solving
60 (2)^(2t) = 983040
2^(2t) = 16384 which just happens to be 2^14
so 2^2t = 2^14
2t = 14
t = 7 , it would take 7 years
it was probably a planned question, if not we would have had to use logarithms
when t = 3
number = 60 (2)^6 = 3840
2. we would be solving
60 (2)^(2t) = 983040
2^(2t) = 16384 which just happens to be 2^14
so 2^2t = 2^14
2t = 14
t = 7 , it would take 7 years
it was probably a planned question, if not we would have had to use logarithms
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