At the beginning of an experiment, the

number of bacteria in a colony was counted

at time t= 0. The number of bacteria in

the colony t minutes after the initial count

is modeled by the function below.

192

165

120

What is the average rate of change in the

number of bacteria for minutes 1 through 3

of the experiment?

9

45

A. 36

B. 48

C. 72

D. 96

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