If $r(-x, y) = -0.5$ then what is the value of $r(x, -y)$?
If r(x,y)=0.7r(x, y) = 0.7r(x,y)=0.7 then what is the value of r(x+0.2,y+0.2)r(x + 0.2, y + 0.2)r(x+0.2,y+0.2)?
