11. A culture of bacteria grows at a continuous, exponential way. If 500 bacteria are present initially and there are 800 after many will be present one hour, how after five hours? Ila How long is it until there are 20,000 bacteria? Il b 12 Find the doubling time of the population of a city that is growing by 24% per ye 12. 13. The temperature, H, in F, of a cup of coffee thours year. after it is set out to cool is given by : How long does it H(+) = 75 + 120 (3) + take the coffee to cool down to 95 ? 13.