To shift the function \( f(x) = \frac{1}{x} \) down by 11 units, you subtract 11 from the function. Therefore, the function \( g(x) \) can be expressed as:
\[ g(x) = f(x) - 11 = \frac{1}{x} - 11 \]
Thus, the correct expression for the function \( g(x) \) is:
\[ g(x) = \frac{1}{x} - 11 \]
Among the options you provided, the correct choice is:
g(x) = 1/x - 11.