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perform the indicated operation

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

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

What is the greatest common factor of 8 and 36