PLEASE HELP END OF 1/4 IS TODAY

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 equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

What is the area of triangle abc if a = 8, b = 11, and c = 15?