. Question 11 A bacteria culture starts with 180 bacteria and grows at a rate proportional to its size. After 6 hours there will be 11180 bacteria. (a) Express the population P after t hours as a function of t. P[t]= {b} What will he the population after 9 hours? [c] How long will it take for the population to reach 23m? Give your answer accurate to at least 2 decimal places. l l hours . Question 13