Question: How would I add a new column? to my data frame using the $ symbol ## Add a new column `grade_diff` to your dataframe, which

How would I add a new column? to my data frame using the $ symbol

## Add a new column `grade_diff` to your dataframe, which is equal to the difference between ## math_grades and spanish_grades. Note: use the variables inside the dataframe (like "students$math_grade") ## not the ones in your workspace.

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