Final answer:
Bob will have $2 left after the show.
Step-by-step explanation:
Bob pays $2 to see a show. To find out how much money he will have left after the show, we need to subtract $2 from the amount he has before the show. So, we subtract $2 from $4:
$4 - $2 = $2
After the show, Bob will have $2 left.
Learn more about Subtraction