Two populations of bacteria were given food treated with different vitamins to see how they would grow. Population A started with 900 bacteria and grew at a steady rate of 30 bacteria each hour, while Population B started with 450 bacteria and grew at a steady rate of 9% each hour.

At what hour will Population B be larger than Population A?

Select your answer from the choices below.

A. hour 10

B. hour 9

C. hour 12

D. hour 11

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )