Hi before I can ask my question I need tofigur out how to get the math symbols like pie and R squared?? Help

Before you can ask your question, you have to know that you need to post your attempt as well.

Also, link (https://www.askmehelpdesk.com/math-sciences/how-technical-scientific-documentation-formulas-50415.html)

If the math symbology isn't too complicated then you can simply express powers using the "^" symbol (for example 5^3 means "five cubed"), and use "pi" for \pi. Be careful to properly use parentheses to avoid confusion. Do not try to cut and paste from other applications as the result will be illegible.