Question

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%0D%0A𝑛%0D%0A, at 8:00 a.m? How many bacteria were there?(1 point)%0D%0AResponses%0D%0A%0D%0A2n=120%0D%0A2%0D%0A𝑛%0D%0A=%0D%0A120%0D%0A; at 8:00 a.m., there were 240 bacteria.%0D%0A 2 n equals 120 ; at 8:00 a.m., there were 240 bacteria.%0D%0A%0D%0A2n=120%0D%0A2%0D%0A𝑛%0D%0A=%0D%0A120%0D%0A; at 8:00 a.m., there were 60 bacteria.%0D%0A2 n equals 120 ; at 8:00 a.m., there were 60 bacteria.%0D%0A%0D%0An2=120%0D%0A𝑛%0D%0A2%0D%0A=%0D%0A120%0D%0A; at 8:00 a.m., there were 240 bacteria.%0D%0AStart Fraction n over 2 End Fraction equals 120 ; at 8:00 a.m., there were 240 bacteria.%0D%0A%0D%0An2=120%0D%0A𝑛%0D%0A2%0D%0A=%0D%0A120%0D%0A; at 8:00 a.m., there were 60 bacteria.

Answer 1

To determine the number of bacteria at 8:00 a.m., we need to understand that the bacteria double every hour.

At 9:00 a.m., there are 120 bacteria. Since the bacteria double every hour, we can find the number at 8:00 a.m. by halving the amount present at 9:00 a.m.

To find the equation representing the number of bacteria \( n \) at 8:00 a.m., we can write:

\[ n \cdot 2 = 120 \]

Therefore, solving for \( n \) gives us:

\[ n = \frac{120}{2} = 60 \]

Thus, the number of bacteria at 8:00 a.m. was 60.

The correct response is:

• \( n \cdot 2 = 120 \); at 8:00 a.m., there were 60 bacteria.