A researcher obtained to following multiple-regression equation

A researcher obtained to following multiple-regression equation 

     20. A   researcher obtained to following multiple-regression equation using two   predictor variables: Y=0.5X1+4.5X2+9.6. given that SSy=210, the SP value for   X1 and Y is 40 and the SP value for X2 and Y is 9, find R2 the percentage of   variance accounted for by the equation.    

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     20. A   researcher obtained to following multiple-regression equation using two   predictor variables: Y=0.5X1+4.5X2+9.6. given that SSy=210, the SP value for   X1 and Y is 40 and the SP value for X2 and Y is 9, find R2 the percentage of   variance accounted for by the equation.    

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