To find \( f(25) \) using the function rule \( f(x) = -\frac{4}{x} \), we will substitute \( x \) with 25:
\[ f(25) = -\frac{4}{25} \]
This fraction simplifies to -0.16, which is not a whole number. Since the question specifies that the result must be a whole number, this implies there may have been an error in interpreting the function or restrictions.
If the function is indeed \( f(x) = -\frac{4}{x} \), then \( f(25) = -\frac{4}{25} \) is the correct calculation, but it does not produce a whole number.
Please verify the function or the requirements. If you need a whole number result, we would need either a different function rule or specific \( x \) values that yield whole numbers.
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