How do I find the coefficient of determination?

a) The least-squares regression equation that shows the best relationship between GPA and the SAT score is (round your responses to four decimal places): y^=1.0660+0.0033x where y^= GPA and x= SAT score. b) For a student with an SAT score of 350 , the expected GPA = (round your response to two decimal placess). c) For a student with an SAT score of 790, the expected GPA = (round your response to fwo decimal places). The coefficient of determination for the leastsquares regression model is (round your response to four decimal placess). The coefficient of determination shows that by using this model, about. of the variation is explained by the model