Define a variable and write an expression for the phrase 4 minus a number a) 4-n b) 4/n c) n/4 d) 4n

The answer would be 4-n
Why? Because if you read it how it says your would end up with 4 minus is another word for subtracting so 4- a number so n. You end up with 4-n

Looks pretty good to me!