Given Sxx=40S_{xx} = 40Sxx=40, Syy=90S_{yy} = 90Syy=90, and Sxy=30S_{xy} = 30Sxy=30, what is the coefficient of determination R2R^2R2?
0.250.250.25
0.330.330.33
0.100.100.10
0.750.750.75