To rotate a point (x, y) by 180 degrees clockwise, you can use the formula (x', y') = (-x, -y).
For the point (5, 8):
- The x-coordinate becomes: -5
- The y-coordinate becomes: -8
Therefore, the new point after a 180-degree clockwise rotation of (5, 8) is (-5, -8).
The correct answer is: (-5, -8).