Why am I getting this error: unexpected '$' in "$" - r

I have found similar questions to this on StackOverflow but none actually give a proper fix
The TA in my course was using this exact code and it was working. This is just the snippet but I keep getting the same problem. Anyone know why?
$n_{i}$
#Hint for Q1
$\hat{\beta_1}=\frac{\sum\limits_{i=1}^n(x_{i}-\bar{x})(y_{i}-\bar{y})}
{\sum\limits_{i=1}^n(x_{i}-\bar{x})^2}$
Then the Error is
Error: unexpected '$' in "$"
Maybe its because I'm running on Ubuntu?

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Unexpected Closing Bracket in R?

eCHFao<- -0.141081
#eCHFa1<-0
eCHFb1<- 0.985833
eCHFg1<- 0.199665
meanCHF<- mean(XtCHF)
eVarCHF<- (array,3421)
eVarCHF[1]<- var(XtCHF)
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