What are the independent variables, the variables that were manipulated by the researcher?

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

This is about circle theorems. someone asap : (

Which is an accurate comparison of the two data sets? the commute to work is typically shorter and more consistent than the commute home. the commute to work is typically shorter but less consistent than the commute home. the commute to work is typically longer and less consistent than the commute home. the commute to work is typically longer but more consistent than the commute home.