I need help analyzing and understanding how I would answer the questions base on the regression models.

In case images are too small: https://imgur.com/a/LGssnMj

1. A real estate builder wishes to determine how house size (House) is influenced by family income (Income), family size (Size), and education of the head of household (School). House size is measured in hundreds of square feet, income is measured in thousands of dollars, and education is measured in years. The builder randomly selected 50 families and ran the multiple regression.

Microsoft Excel output is provided below:

SUMMARY OUTPUT

\fRegression Statistics Multiple R 0.992 R Square 0.984 Adjusted R Square 0.979 Standard Error 2.26743 Observations 20 ANOVA dt SS MS F Signif F 4 4609.83164 1152.45791 224.160 0.0001 15 77.11836 5.14122 Total 19 4686.95000 Coeff StdError t Stat -value Intercept -9.611198 2.77988638 - 3.457 0.0035 Age 1.327695 0.11491930 11.553 0.0001 Exper - 0.106705 0.14265559 0.748 0.4660 Degrees 7.311332 0.80324187 9.102 0.0001 Prevjobs 0.504168 0.44771573 - 1.126 0.2778