In the equation \( C = 18 + 4x \):
- \( C \) represents the total cost,
- The constant \( 18 \) represents a fixed cost (like a base fee or an initial charge),
- The coefficient \( 4 \) represents the variable cost per item, in this case, books.
Given those interpretations:
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Statement #1: "Tatiana spent $4.00 per book at the public library." This is correct because the coefficient \( 4 \) indicates the cost per book.
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Statement #2: "Tatiana spent $18.00 per book at the public library." This is incorrect because the $18 represents a fixed cost, not the cost per book.
Therefore, Statement #1 could be a correct interpretation of the coefficient of a term.