At the beginning of a study, a certain culture of bacteria has a population of 40. The population grows according to a continuous exponential growth model. After 5 days, there are 124 bacteria. (a) Letr be the time (in days) since the beginning of the study, and let y be the number of bacteria at timer. Write a formula relating y tor. Use exact expressions to fill in the missing parts of the formula. Do not use approximations. y = 80g (5) (b) How many bacteria are there 7 days after the beginning of the study? Do not round any intermediate computations, and round your answer to the nearest whole number. bacteria Oino Ś