Write an exponential growth model for the bacteria population.

I am not sure what I have done wrong.  I dont know why I was able to get a and d correct.  what is the answer for b and c??  The work is online.  I would like to see how the problems are worked out so I will know what to do on an exam.  thank you

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The number of bacteria in a culture is increasing according to the law of exponential growth. There are 145 bacteria in the culture after 2 hours and 425 bacteria after 4 hours.

(a) Find the initial population. (Round your answer to the nearest whole number.)Â
  bacteriaÂ

(b) Write an exponential growth model for the bacteria population. Let t represent time in hours.Â
y =Â

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