A bacteria culture starts with 420 bacteria and grows exponentially. After 2 hours there will be 840 bacteria. (a) Express the number of bacteria A as a function oft hours passed. Note: Round the growth rate to 4 dec. places. A(t)= (b) Use the model from part a to determine the number of bacteria, rounded to a whole number, after 6 hours: (c) Use the model from part a to determine the number of hours, rounded to 1 dec. place, for the population to reach 1680:

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