Phil received a prize of x dollars from a poker tournament. the tournament cost him 100 dollars to enter. what were phil's net winnings from the tournament? write your answer as an expression.

Phil gets x dollars, but before he gets x dollars, he needs to pay 100 dollars to enter the tournament. Therefore the net winning is not x dollars but you should substract 100 dollars from x.
So, the expression of the net winning will be 100-x

What the heck don’t understand