Superscript and Subscript text

Annotation 2020-05-27 132947

I Have tried to use inline LaTeX operator ($) in addition to the double operator but neither seems to work. I have also tried using footnotes to achieve the same effect as a superscript but doesn’t work. Do you know how i would be able to combat this? I have attached an image of how I am currently writing my text when I have to do dimensional analysis for equations.