Final answer:
The total amount Warren spends at the fair is represented by the expression 8 + 0.50x, where x is the number of roller coaster rides he takes.
Step-by-step explanation:
The question requires us to write an expression that shows how much Warren spends at the fair if he rides the roller coaster x times. Warren pays an entrance fee of $8 plus an additional cost of $0.50 each time he rides the roller coaster. Therefore, the expression to calculate Warren's total spending at the fair is:
8 + 0.50x
where x represents the number of times Warren rides the roller coaster.