A culture of a certain bacteria doubles every hour. At 9:00 a.m, there were already 120 bacteria. Which equation represents the number of bacteria, n, at 8:00 a.m? How many bacteria were there? (1 point)

Answer 1

To find the number of bacteria at 8:00 a.m, we need to work backward from 9:00 a.m when there were already 120 bacteria.

Since the bacteria culture doubles every hour, at 8:00 a.m, it would be 1 hour before there were 120 bacteria. Therefore, there would be half the number of bacteria at 8:00 a.m.

Let's represent the number of bacteria at 8:00 a.m as n.

So, the equation that represents the number of bacteria at 8:00 a.m is:

n = 120/2

Simplifying, we get:

n = 60

Therefore, there were 60 bacteria at 8:00 a.m.