PLEASE HELP ASAP

9 Pre-study scores versus post-study scores for a class of 120 college freshman English students were considered. The least squares repression line was g = 0.2 +0.9ar with a correlation coefficiente -0.68. What percent of the variation of post-study scores can be explained by the variation in pre-study scores? 824% 68.0% 46.2% 90.0% We cannot determine the answer using the Information given