The fill in the blanks for Quizzes.next doesn't have an html editor or a math editor. However, while tinkering tonight, it turns out that it is very easy to add a subscript. For example, S naught or S_0 in classic doesn't work but it is possible to use the following:

`\(S_0\)`

I made this a discussion in case others have discovered other hidden ways to add math to fill-in-the-blanks. For example, the following didn't work for me (no square root) and maybe someone can explain what I did wrong.

`\(sqrt{a^2+b^2}=c^2\) `

I look forward to discovering more!

The \( and \) invoke math mode in LaTeX.

The square root is \sqrt{} in LaTeX, you're missing the \ in front of the \sqrt.

It's really weird that you would want \sqrt with the Pythagorean identity. I don't use Quizzes.Next, is this getting partial credit for choosing this one?

Canvas also support Unicode, so you may want to look at the subscripts available as Unicode as an alternative: Unicode subscripts and superscripts - Wikipedia