Question

PLEASE HELP ME FFS

A culture is tested for bacteria and has 1.3 million bacteria. The culture is then tested every 15 minutes and each time it is tested there are 3.5 times more bacteria.

How many bacteria in millions will there be in the culture after 30 minutes?

Round to the nearest hundredth.

1.3
4.55
15.93
55.74

Answer 1

55.74

Explanation:

Since the culture was tested and then the countdown started, you need to multiply the initial value by 3.5. Since it is tested once every 15 minutes, it will be tested two more times by the time 30 minutes is up; a total of 3 times tested.

1.3 x 3.5 = 4.55

4.5 x 3.5 = 15.925

15.925 x 3.5 = 55.7375