Question:
Let $m$ be a positive integer, and suppose that $9$ is its own inverse $\pmod m$, but $3$ is $\textbf{not}$ its own inverse $\pmod m$.

How many possible values for $m$ are there?

Answer:
If $9$ is its own inverse $\pmod m$, then $9\cdot 9\equiv 1\pmod m$, or in other words, $m$ is a divisor of $9^2-1=80$.

But if $3$ is $\textbf{not}$ its own inverse $\pmod m$, then $3\cdot 3\not\equiv 1\pmod m$, so $m$ is not a divisor of $3^2-1=8$.

Thus, we wish to count divisors of $80$ which are not divisors of $8$. There are ten divisors of $80$: $$1, 2, 4, 5, 8, 10, 16, 20, 40, 80.$$ Of these, six are not divisors of $8$: $$5, 10, 16, 20, 40, 80.$$ Therefore, there are $\boxed{6}$ possible values of $m$.