The first screenshot is the formula. It is a part of my assignment. However, when I compile it, I got a lot of Missing $ inserted I cannot understand why. Thank you! The formula

the information about the error

  • 3
    Welcome to TeX.SX! Please do not paste code as images, but as code starting with \documentclass and ending with \end{document}. – Bobyandbob Nov 15 '17 at 10:19
  • when you use equation comand, I think that there is no need $ inside P/S next time write the code instead of using an image :) – mortal Nov 15 '17 at 10:20
  • 4
    Don't use $ ... $ constructs inside mathematical environments like equation, align, gather, &c. – Bernard Nov 15 '17 at 10:22

$ shifts from text mode to math mode and back. \begin{equation} starts math mode, R^i_t = is fine. Then $ ends math mode and enters text mode. Then \alpha is used in text mode and you get an error.

So change

  R^i_t = $\alpha$ + $\beta$R^M_t + $\mu$_t


  R^i_t = \alpha + \beta R^M_t + \mu_t

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