rotation of 90° counterclockwise about the origin
rotation of 180° about the origin
reflection across the xaxis
rotation of 90° clockwise about the origin
1 Answer

Try a few points and you'll see what happens. For example if you had the point (2,3) in the first quadrant, you'll end up with the point (2,3) in the third quadrant.
That's equivalent to a rotation of 180° about the origin.