The circumference of a circle is 169.56 kilometers what is the circles radius

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

Find the value of x for which abcd must be a parallelogram -9-6x x-30

If angle 2=3x +1 and angle 3=2x +4what is angle 2