Three million E. coli bacteria are present in a laboratory culture. An antibacterial agent is introduced and the population of bacteria P (1) decreases by half every 3 hr. The population can be represented by P(t)=3,000,000 1/3 (+)" Part: 0/2 Part 1 of 2 (a) Convert the given model to an exponential function using base e. Round the value of k to five decimal places. P(t)=