If the polygon with vertices
H = (-3,0), I = (-5,4), J = (0,6), K = (5, 4) and
L = (3, 0) is dilated to become the polygon with vertices
H' = (-9,0), I' = (–15, 12), J' = (0, 18), K' = (15, 12)
and L' = (9, 0), what is the scale factor?