The graph below represents the distance a pilot is from the home airport during a period of time. A graph titled Pilot's Distance from Home. The horizontal axis shows time (hours) and the vertical axis shows distance (miles). Both axes are unnumbered. A line is shown in 3 sections, labeled I, II, and III. Sections I and III show a reduction in distance over time and section II is constant.

Which describes the pilot’s distance in section I?

zero
constant
decreasing
increasing

The biologist has a second culture to examine. she knows that the population of the culture doubles every 15 minutes. after 1 hour and 15 minutes, her assistant found that 80,000 bacteria were present. a) what was the size of the initial population? b) predict the size of the culture at t=3 hours. what was the size of the population at 40 minutes? explain and justify your answers. c) create a graph of the population as a function of time. find an equation that can be used to predict the size of the population at any time t. d) examine the rate at which the bacteria culture is growing. how fast is the culture growing after 1 hour? after 1.5 hours? after 2 hours? use a time interval of h = 0.01 hours to estimate these rates. interpret these rates in terms of the context of the problem situation. how do these three rates compare?