9. The toll T charged for driving on a certain stretch of a toll road is $5 except during rush hours

9. The toll T charged for driving on a certain stretch of a toll road is $5 except during rush hours (between 7 AM and 10 AM and between 4 PM and 7 PM) when the toll is $7.
(a) Sketch a graph of T as a function of time t, measured in hours past midnight.
(b) Discussed the discontinuities of this function and their significance to someone who uses the road.

Calculus: Early Transcendentals
Chapter 2: Limits and Derivatives
Section 2.5: Continuity
Problem 9

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