Ineed to know how to solve these equations

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

Write 17/20 as a decimal and as a percent.

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?