what does the number of degrees of freedom associated with the regression sum of squares in an anova table for a multiple regression equation equal?

In a regression and correlation analysis where r squared = 0 what must sse be ?

If a multiple regression analysis is based on 9 independent variables, and a sample of 125 observations, what is the value of the denominator used in the calculation of the multiple standard error of estimate?

Testing the global null hypothesis that all regression coefficients are zero is based on what in the multiple regression analysis?