Research scientists need a certain type of bacteria to conduct an experiment. there are 100 bacteria in a certain culture. the culture grows at a rate of 70% daily. the scientists need at least 1,400 bacteria to conduct an experiment. what is the least number of days they must wait for the bacteria culture to reach a quantity of 1,400? (hint: use a guess-and-check method to determine the lowest number of days that satisfy the requirement.) a. 4 days b. 5 days c. 6 days d. 7 days