Explanation
Correct answer: C.
Choice C is correct. It's given that the technician charges $ per hour for labor. Therefore, if the job takes hours, the technician will charge \left( \frac{\ 60}{1 \text{hour}} \right) \left( x \text{hours} \right), or \$$60 x, for labor. It's also given that the technician charges $ for parts. Therefore, represents the total amount, in dollars, the technician will charge for this job if it takes hours.
Desmos solution:
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice A
Choice A is incorrect and may result from conceptual or calculation errors.
Choice B
Choice B is incorrect. This function represents the total amount, in dollars, the technician charges for labor only, not the total amount charged for labor and parts.
Choice D
Choice D is incorrect. This function represents the total amount, in dollars, the technician would charge if the charge for parts were subtracted from, rather than added to, the charge for labor.