Need R code and Explanation.

In this quesiton we will make use of two datasets. The gapminder data contains an excerpt of country$-$level data on the quality$-$of$-$life measures. The indicator hiv estimated prevalence.csv data contain a measures of the prevalence of HIV in each country by year. After loading$/$importing each dataset, answer the following question.

a$.)$ What is the relationship between HIV prevalence and life expectancy? Generate a scatterplot with a smoothing line to report your results. You will need to perform a $*\_$join $()$ operation $($think carefully about which type makes the most sense and explain why$).$ Hint: You may need to create a new variable to have a unique key to join your tables by$.$