I’m working on a health & medical writing question and need the explanation and answer to help me learn.

Simple Regression Analysis looks at the relationship between a single independent variable and a dependent variable. Multiple Regression Analysis looks at the relationship between more than one independent variable and a dependent variable. 

1) What measures may be used to evaluate the quality of the relationship between independent variables and the dependent variable? 

2) What measures may be used to evaluate the relationship between all of the independent variables and the dependent variable?