The graph below shows the distance, y, in feet, of a mouse from its hole, for a certain amount of time, x, in minutes: Graph titled Distance Vs Time is shown with Time in minutes along the x-axis and Distance from Hole in miles along the y-axis. The scale on the x-axis shows the numbers 0 to 45 at increments of 9, and the scale on the y-axis shows the numbers 3 to 24 at increments of 3. A straight line joins the ordered pairs 0, 9 and 9, 12 and 18, 15 and 27, 18 and 36, 21. Based on the graph, what is the initial value of the graph and what does it represent?