Question

Which algebraic expression represents the difference of 54 and s number

Answer 1

the other guy is correct

Answer 2

`\huge\boxed{54-x}`

I'm assuming you meant "the difference between 54 and a number". We'll use
`x` to represent the number.

The word "difference" means that we will use subtraction, making the answer...

`\boxed{54-x}`