The point 5,10 is reflected across the x- axis. What are the coordinates of the reflected point.
When a point is reflected across the x-axis, the x-coordinate remains the same, but the sign of the y-coordinate changes.
For the point (5,10), the x-coordinate remains 5, but the y-coordinate changes from 10 to -10.
Therefore, the coordinates of the reflected point are (5,-10).