(Solved): (4 points) A bacteria culture starts with 400 bacteria and grows at a rate pr ...

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(4 points) A bacteria culture starts with 400 bacteria and grows at a rate proportional to its size. After 9 hours, there are 9000 bacteria. A. Find an expression for the number of bacteria after \( t \) hours. B. Find the number of bacteria after 10 hours. C. Find the growth rate after 10 hours. D. After how many hours will the population reach \( 30000 ? \) Note: You can earn partial credit on this problem. You have attempted this problem 0 times. You have unlimited attempts remaining.