Draw a graph of the number of bacteria versus time for the following story: dave is doing an experiment with a type of bacteria that he assumes divides in half exactly every 30 min. he begins at 8: 00 a. m. with 10 bacteria in a petri dish and waits for 3 hr. at 11: 00 a. m., he decides this is too large of a sample and adds chemical a to the dish, which kills half of the bacteria almost immediately. the remaining bacteria continue to grow in the same way. at noon, he adds chemical b to observe its effects. after observing the bacteria for two more hours, he observes that chemical b seems to have cut the growth rate in half.