The expression you are describing can be represented as follows:
\[ 3x + 18 \]
Explanation of the components:
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Variable (x): This represents the unknown cost of the entry fee for the folklorico show.
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Coefficient (3): The coefficient in front of the variable \(x\) signifies that the cost \(x\) is being multiplied by 3, indicating that three entries to the folklorico show were purchased.
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Constant (18): The constant 18 represents the fixed amount spent on snack tickets, which is $18.00.
Thus, the entire expression \(3x + 18\) effectively models the total cost incurred from purchasing three entries to the folklorico show plus the cost of snack tickets.