Need to use R to make a simple regression model like: X= βA+α+μ to determine the

Need to use R to make a simple regression model like: X= βA+α+μ to determine the effect of S&P500 on medical expenditure. Based on the data you could find.
This could be a draft but need to fulfill 3 pages and one chart at least.(The total could be 5 pages but we could talk about it later for extra money)
The example is not useful but just shows the structure of the paper.