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1. At time t = 0, measured in hours, a scientist puts 50 bacteria into a gel on a dish. The bacteria are growing and the population is expected to show exponential growth. function: b(t) = 50 . e (0.25t) . continuous growth rate per hour: 2. In 1964, the population of the United States was growing at a rate of 1.4% annually. That year, the population was approximately 192 million. The model predicts the population, in millions, t years after 1964. . function: p(t) =_ e . continuous growth rate per year: 1.4% 3. In 1955, the world population was about 2.5 billion and growing. The model predicts the population, in billions, t years after 1955. . function: q(t) = . e (0.0168t) . continuous growth rate per year