Gilbert earns $7.50 per hour washing cars. graph the relationship between the number of hours gilbert works and the total amount of money he earns.

You can put the dollars on the y axis and the hours on the x axis. Whenever the hours increase by 1, move over 1 on the x axis and 7.50 up on the y axis. 
The first point should be (1, $7.50).                                         ↑      ↑                                     hours, money earned
The second point then will be (2, $15.00), the third will be (3, $22.50), and so on.

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Step-by-step explanation:

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In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.