This exercise uses the population growth model. A certain culture of the bacterium Rhodobacter sphaeroides initially has 15 bacteria and is observed to double every 4 hours. (a) Find an exponential model n(t) = n02t/a  for the number of bacteria in the culture after t hours. n(t) =      (b) Estimate the number of bacteria after 13 hours. (Round your answer to the nearest whole number.)  bacteria   (c) After how many hours will the bacteria count reach 1 million? (Round your answer to one decimal place.)

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