Question: Use the following function rule to find $f(81)$.
$f(x) = \frac{x}{27}$
$f(81) =$
1. **State the problem:** We need to find the value of the function $f(x) = \frac{x}{27}$ when $x = 81$.
2. **Write the formula:** The function is given by
$$f(x) = \frac{x}{27}$$
3. **Substitute the value:** Replace $x$ with $81$:
$$f(81) = \frac{81}{27}$$
4. **Simplify the fraction:** Both numerator and denominator are divisible by $27$:
$$f(81) = \frac{\cancel{27} \times 3}{\cancel{27}} = 3$$
5. **Final answer:**
$$f(81) = 3$$
This means when you input $81$ into the function, the output is $3$.