Answer:
C = $18.25
Explanation:
The question asks for the total cost for an order of 50 copies, considering that the printing service charges a set-up fee of $15.75 and an additional 5 cents for each copy. The total cost, denoted as 'C', can be calculated using the formula:
C = 0.05x + 15.75

To find the total cost for an order of 50 copies, we plug in x = 50 into the formula:
⇒ C = 0.05(50) + 15.75
⇒ C = 2.50 + 15.75
∴ C = $18.25
So, the total cost for an order of 50 copies is $18.25.