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OpenStudy (anonymous):
The number of bacteria in a sample increased by a factor of 2 every minute from 9:05 AM to 9:55 AM. The function below shows the number of bacteria in the sample f(x) after x minutes from 9:05 AM:
f(x) = 10(2)x
Which of the following is a reasonable domain for the function?
0 ≤ x ≤ 10
5 ≤ x ≤ 55
0 ≤ x ≤ 50
All positive integers
OpenStudy (anonymous):
the x in the formula is an exponent
OpenStudy (anonymous):
so it is f(x) = 10(2)^x
OpenStudy (anonymous):
@Abhisar @Luigi0210 @Loser66 @AravindG
OpenStudy (kendricklamar2014):
The function below shows the number of bacteria in the sample f(x) after x minutes from 9:05 AM
Domain is the x values that you can use.
What is the smallest number of minutes from 9:05 AM??
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OpenStudy (anonymous):
from 9:05 to?
OpenStudy (kendricklamar2014):
What I wanted to show you is, we don't wait any time at all. So \[x = 0\]
OpenStudy (anonymous):
oh
OpenStudy (anonymous):
so now I am thinking it's a
OpenStudy (kendricklamar2014):
Now, the next thing you need to know is the last x number. The question says: From 9:05 - 9:55 A.M. How many minutes is 9:55 from 9:05??
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OpenStudy (anonymous):
50
OpenStudy (kendricklamar2014):
Yes, so the smallest x = 0 and the biggest x = 50. Which choice shows: x from 0 - 50 @KaylaIsBae
OpenStudy (anonymous):
C
OpenStudy (kendricklamar2014):
Yes, so the answer is: \[0\le x \le 50 \]
OpenStudy (anonymous):
thanks :)
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