What is the name of a number that when multiplied by itself gives the original number

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

Which system of linear inequalites is represented by the graph?

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.