Part A: The s-intercept is (0,6). The s-intercept represents the amount of shirts sold in the hundreds. There t-intercept in this problem. And Since there is no t-intercept, t represents the year of 2000
Part B: How the graph reacts is as it starts, it starts out as a steady, strait line. Then when it hits (-4,5) it start to incline slightly. What it means is it is doing really well.
Part C: The average rate of change is 0.333333 over a distance of 6.32456.
Part D: The graphs would differ greatly, because f(t) inclines slowly where g(t) would be way steeper and be vertical way before f(t)