"During a certain epidemic, the number of people at are infected at any time increases at a rate proportional to the number of people that are treated at that time. If 700 people are infected when the epidemic is first discovered, and 900 people are infected 2 days later, how many people are infected 5 day- after the epidemic is first discovered? 8. A population y grows according to the equation a where k is a constant and t is measured in years. If the population doubles every 19 years, then what is the value of k