(x-3)^2, as x-3 is repeated twice
Answer: to make 78 copies it cost 26 dollars.
Step-by-step explanation:
18 copies - 6 dollars
78 copies - x dollars
Hence,

There are many ways to do this.
One way could be 0.25x+7.00=27
Answer:

Third answer is correct.
Step-by-step explanation:

hope this helps you.