The following graph shows the relationship between the number of cars on a certain road an...

The following graph shows the relationship between the number of cars on a certain road and the time of day for times between 5:00 A.M. and 9:00 A.M.:

a. What was the increase in the number of cars on the road between 6:30 A.M. and 7:00 A.M.?

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b. During which half hour was the increase in the number of cars the greatest?

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c. What was the increase in the number of cars between 8:00 A.M. and 8:30 A.M.?

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d. During which half hour(s) did the number of cars decrease? By how much?

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e. The graph for this problem is composed of segments rather than just points. Why do you think segments are used here instead of just points?