1. Find the distance between the point (1,-4,-3) and the plane 2x-3y + 6z = -1. 2. Find the distance between the parallel planes -2x + y + z = 1 and 6x-3y - 3z - 5 = 0. 3. Find the distance between Q(1,2,3) and 2x - y + z = 4 4. Find the distance between the point P (0, 1, 5) and the plane 3x+6y-2z-5 = 0. 5. Find the distance between the parallel planes x + y + z = 1 and x + y + z = -1. 6. Find the distance between the skew lines L₁x=3-t, y = 4 + 4t, z = 1 + 2t & L₂ : x = t, y = 3, z = 2t.