The table below represents the distance of a train from its destination as a function of time: time (hours) x distance (miles) y 0 665 1 570 2 475 3 380 4 285 part a: what is the y-intercept of the function, and what does this tell you about the train? (4 points) part b: calculate the average rate of change of the function represented by the table between x = 1 to x = 4 hours, and tell what the average rate represents. (4 points) part c: what would be the domain of the function if the train continued to travel at this rate until it reached its destination? (2 points)