Algebra-2

Question Analysis
This question tests the student's ability to write a function in function notation based on a real-world context. The function calculates the total cost of buying pencils, where each pencil costs $0.75.

Key Concept Explanation
Function notation is a way to express a function using a specific format. In this case, the function represents the total cost when the number of pencils is . The rule given is to multiply the number of pencils by the cost per pencil.

Step-by-step Solution
1. Identify the input variable:
2. Determine the cost per pencil: $0.75
3. Multiply the number of pencils by the cost per pencil:

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