1-1 Relations and Functions An electrician charges $35 to make a trip to a job site. She charges an additional $50 per hour for two hours or less. If the job takes over two
hours, she charges $45 per hour and doesn't charge for the trip.
A mapping diagram for her rates from 1 to 4 hours, including half hours, is shown.
Domain
Range
1
85
1.5
2
2.5
- 110
135
112.5
157.5
3
3.5
4
+180
Is the relation between hours and dollars charged a function? Explain.
A. No: for any given number of hours, there is only one possible cost
B. No, for 135 there are two possible numbers of hours.
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C. Yes, for any given number of hours, there is only one possible cost.
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