Final answer:
The subject of this question is Mathematics. Elaine's business of repairing computer servers involves charging a base fee of $75.00 for each visit and $25.00 per hour for her services.
Step-by-step explanation:
The subject of this question is Mathematics. Elaine's business of repairing computer servers involves charging a base fee of $75.00 for each visit and $25.00 per hour for her services. The total cost for her repairs and the hours it takes to repair the server can be represented by the function c(x) = 75 + 25h.