Final answer:
The student's question involves using the expression 15.89c + 25 to calculate the total cost based on a variable number of items (c) purchased at $15.89 each with an additional flat fee of $25.
Step-by-step explanation:
The student's question seems to be based on a shopping scenario involving mathematics, specifically on calculating the total cost of items based on a given number of items bought and a fixed price per item. Although the question contains some unclear parts, the relevant information can be derived from the expression 15.89c + 25, where c represents the number of items purchased.
For example, if the student intended to ask how to calculate the total cost of items bought at a price of $15.89 each plus an additional flat fee of $25, the expression would be used by inserting the actual number of items (c) into the equation. If 5 items were bought, the total cost would be calculated as 15.89 * 5 + 25. To compute the numerical answer, we would perform the multiplication first, followed by the addition, in accordance with the order of operations.