Posted by katrina on Tuesday, March 1, 2011 at 12:28am.
b. [(1.12)^15 -1] x 100
The x 100 is for conversion %
c. about 6 hours, using the "rule of 72"
For the exact answer (t), solve
(1.12)^t = 2
your formula would be
Amount = a(1.12)^t , where 0 ≤ t ≤ 15
a) in 1 hour growth factor would be 1.12
b) Amount = a(1.12)^15 = 5.47a
percentage of growth = 5.47a/a = 5.47 or 547%
2a = a(1.12)^t
2 = 1.12^t
log2 = log(1.12^t)
log2 = t log1.12
t = log2/log1.12 = 6.1
I do not agree with Reiny's answer #2. They asked for the change, so 1 must be subtracted from 1.12^15
This would result in a 447% increase, to 547% of the initial value
drwls is correct, I should have subtracted to get the change.
(Can I blame it on the fact that I was only on my first cup of coffee ?)
Math - A culture of bacteria in a petri dish is doubling every hour. If there ...
precal - A petri dish contains only two bacteria. The bacteria divide every half...
Math - How do I solve this if there is no equation to this 1. The population of ...
math - sam has a savings amount that increased in value over a twelve month ...
ALGEBRA 2 - Predict the population of bacteria for each situation and time ...
S.A.T Math - I do not understand This: Employee x is paid $12.50 an hour for the...
math 12 - The bacterium Escherichia coli, or E-coli, has a doubling period of 0....
.. - are most petri dishes the same size? if so what would the diameter of one ...
Calculus - A bacteria culture contains 200 cells initially and grows at a rate ...
science - are most petri dishes the same size? if so what would the diameter of ...
For Further Reading