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)
Responses
2n=120; at 8:00 a.m., there were 240 bacteria.
2 n equals 120 ; at 8:00 a.m., there were 240 bacteria.
n2=120; at 8:00 a.m., there were 60 bacteria.
Start Fraction n over 2 End Fraction equals 120 ; at 8:00 a.m., there were 60 bacteria.
2n=120; at 8:00 a.m., there were 60 bacteria.
2 n equals 120 ; at 8:00 a.m., there were 60 bacteria.
n2=120; at 8:00 a.m., there were 240 bacteria.
Start Fraction n over 2 End Fraction equals 120 ; at 8:00 a.m., there were 240 bacteria.
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The correct equation is: 2n=120. At 8:00 a.m., there were 60 bacteria.
The correct equation that represents the number of bacteria, n, at 8:00 a.m is 2n = 120. At 8:00 a.m., there were 60 bacteria.
The equation that represents the number of bacteria, n, at 8:00 a.m is 2n=120. This is because the culture doubles every hour, so from 9:00 a.m. to 8:00 a.m., there is a 1 hour difference. To find the number of bacteria at 8:00 a.m, we can divide the current number of bacteria (120) by the doubling rate (2).
Solving the equation 2n=120, we get n=60. Therefore, at 8:00 a.m., there were 60 bacteria.