22. {b} (C) The population ofhacteria in a laboratory experiment is given by the function: 2! f(x) = 30 - (e)? , where t is the time in hours sing the start of the experiment. How fast is the population increasing after 2.5 hours? [A f 3] Determine the time, to the nearest minute after the start of the experiment [A f 3] when the population is increasing by 'J' bacteria per hour. At what rate is the population changing when the number [A f 3] of bacteria has doubled