A culture started with 6000 bacteria. after 4 hours, it grew to 7800 bacteria. predict how many bacteria will be present after 18 hours. use the exponential growth formula and round to the nearest whole number.

From the 6000 bacteria, it grew to 7800 bacteria after 4 hours. The increased in 4 hrs was 1800 bacteria, so we can say that there are 450 bacteria growing per hour. After 18 hrs, we can predict that there will be 14,000 bacteria will be present in the culture.