I FOUND YOUR COMPLETE QUESTION IN OTHER SOURCES. SEE ATTACHED IMAGE, PLEASE. The first thing we must do for this case is to define variables. n = number of 5k races covered f = end time. We have the following equation: f = -1.2n + 38.1 We note that the slope of the line is: m = -1.2 minutes per race Therefore, the time decreases 1.2 minutes when the number of races increases n. Answer: The model predicts that for each additional race to runner has run, the finishing time decreases by about 1.2 minutes