Which operation is represented by 2x

Aregression was run to determine if there is a relationship between hours of tv watched per day (x) and number of situps a person can do (y). the results of the regression were: y=ax+b a=-0.662 b=30.418 r2=0.703921 r=-0.839

In trapezoid klmn, kj=19.2 and jm=22.5. identify ln.

What is the distance between the points 4,10 and -3,-14 on the coordinate plane