Twice the difference of a number d and 6

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

What is the value of r of the geometric series?

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?