At the beginning of a study, a certain culture of bacteria has a population of 80. The population grows according to a continuous exponential growth model. After 13 days, there are 216 bacteria. (a) Let be the time (in days) since the beginning of the study, and let y be the number of bacteria at time f. Write a formula relating y to f. Use exact expressions to fill in the missing parts of the formula. Do not use approximations. Ge □ In O y = De (b) How many bacteria are there 16 days after the beginning of the study? Do not round any intermediate computations, and round your answer to the nearest whole number . bacteria​