According to the SPSS output, what percentage of the variance in health knowledge is explained by age and academic knowledge?

Assume that age and academic knowledge (graded exam: 0–100%) have been shown to be related to health knowledge (knowledge questionnaire score: 0–100%) among teens. A nurse researcher would like to use the data she has collected from a random sample of 118 teens living in urban centers of New York to predict their health knowledge. She enters the data she has from their academic knowledge test and their ages into SPSS and formulates the following tables from the multiple regression
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Modelb 1 *Dependent Variable: health_knowledge All requested variables entered. Model 1 Variables Entered/Removed. Variables Entered academic knowledge, age Change Statistics Adjusted R R-Squared R-Squared 0.864¹ 0.747 0.743 *Predictors: (Constant), academic knowledge, age Variables Removed Model Summary Std. Error of the Estimate 2.13687 Method Enter R- Squared FSquare Change Change df₁ 0.747 167.056 2 113 R-Squared df₂ Change 0.000