You brake your car from a speed of 55 mph. The table shows data that represent your car's speed versus the amount of time elapsed from the moment that you began to brake. Elapsed Time (sec) Speed (mph) 1 45 2 35 3 25 4 15 5 15 6 15 Evaluate the following graph based on the data in the table. What is the slope of the line segment that represents the period of time during which the speed decreases?