Question

The number of bacteria in a sample increased by a factor of 2 every minute from 9:05 a.m. to 9:55 a.m. The function below shows the number of bacteria in the sample f(x) after x minutes from 9:05 a.m.:

f(x) = 10(2)^x

Which of the following is a reasonable domain for the function?

0 less than or equal to x less than or equal to 10
5 less than or equal to x less than or equal to 55
0 less than or equal to x less than or equal to 50
All positive integers

Answer 1

0 ≤ x ≤ 50

Answer 2

3rd option