SOLUTION: The number of bacteria in two colonies, A and B, starts increasing at the same time. The number of bacteria in the colony A after t hours is modelled by the function- A(t)=12e^0.4t

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Question 1174303: The number of bacteria in two colonies, A and B, starts increasing at the same time. The number of bacteria in the colony A after t hours is modelled by the function- A(t)=12e^0.4t.
How long does it take for the number of bacteria in colony A to reach 400.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
 How long does it take for the number of bacteria in colony A to reach 400.
 
  A(t)=12e^0.4t  
  400 = 12e^0.4t 
 ln(400/12) = .4t
 ln(400/12)/.4 = t

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