Answer
$m=1.96$
Work Step by Step
We are given that we have solutions at $\alpha=(m+1/2)\pi$.
Isolating the equation for $m$, we obtain:
$m=\alpha/\pi-1/2$
Now we can use the alpha found in part 17f ($\alpha=7.7252$) to find the associated $m$ value.
$m=7.725/\pi-1/2$
$m=1.96$
