Final answer:
The transformation resulting from reflecting a figure across the y-axis and then across the x-axis is a 180-degree rotation.
Step-by-step explanation:
When reflecting a figure across the y-axis, all points of the figure that were on the right side of the y-axis will now be on the left side, and vice versa. When reflecting a figure across the x-axis, all points of the figure that were above the x-axis will now be below the x-axis, and vice versa.
Therefore, reflecting a figure across the y-axis and then across the x-axis results in a transformation called a 180-degree rotation.