| $x$ | $f(x)$ |
|---|---|
| $0$ | $5$ |
| $1$ | $\frac{5}{2}$ |
| $2$ | $\frac{5}{4}$ |
| $3$ | $\frac{5}{8}$ |
The table above gives the values of the function $f$ for some values of $x$. Which of the following equations could define $f$?
Difficulty: Medium
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| $x$ | $f(x)$ |
|---|---|
| $0$ | $5$ |
| $1$ | $\frac{5}{2}$ |
| $2$ | $\frac{5}{4}$ |
| $3$ | $\frac{5}{8}$ |