Answer:
3900 bacteria will be present
Explanation:
A culture started with 2000 bacteria and after 2 hours it grew to 2200 bacteria, determining the rate, we can assume that for every hour, 100 bacteria adds onto the culture. Therefore:
If 19 hours have passed, multiply 100 by 19 to insinuate the every hour per 100 bacteria.
19 * 100
1900
Now you can add this to the original starting bacteria:
2000 + 1900
3900 bacteria