The first thing we need to know are the prices:
popcorn 4 $
large pretzel $ 3
small soda 2 $
water $ 2
ticket costs $ x
The second thing we need to know is how many things were bought:
they bought:
four large pretzels
four bottles of water
four tickets
the mathematical expression is
Total cost: 4x + 4 (3) +4 (2)
simplifying
Total cost: 4x + 20
answer
The total cost of tickets and snacks or beverages was:
Total cost: 4x + 20