How to insert math equations here

So I've figured out that this site doesn't support scripts and there's no one line code to display anything correctly, but there is a work around.

Go to https://quicklatex.com/. It supports KaTex, obviously. Clear the dialog box and type in your equation, for example:

$$\int_a^b f(x)\thinspace dx=\lim\limits_{\Delta\to 0}\sum_{k=1}^n f(\bar{x}_k)\cdot \Delta x_k$$

Hit "Render!" This will display an image that is permanently saved on their end. You can copy the image address and place it inside of the img src command. The result:

The background is transparent and the default lettering is black. The only drawback is that even with stylizing, there seems to be no way to change that, but it's a start!