The problem states that the function $C$ gives the cost, in dollars, of buying $n$ apples. We need to determine which statement best represents the meaning of $C(10) = 9$.

1. Problem Description

The problem states that the function $C$ gives the cost, in dollars, of buying $n$ apples. We need to determine which statement best represents the meaning of $C(10) = 9$.

2. Solution Steps

The expression $C(10)=9$ means that if you input $n=10$ (number of apples) into the function $C$, the output is 9 (cost in dollars).

This means that buying 10 apples costs 9 dollars.

Let's look at the answer choices:

A. The cost of buying 9 apples: This corresponds to finding the value of $C(9)$, not $C(10)$.

B. The cost of 9 apples is $10: This corresponds to$C(9) = 10$, not$C(10) = 9$.

C. The cost of 10 apples: This statement is incomplete, as it does not give a specific cost.

D. Ten apples cost $9: This is the correct interpretation of$C(10) = 9$.

3. Final Answer

D. Ten apples cost $9.