Yes, figure V is a reflection of figure U across the y-axis.
Here's why:
The corresponding points of the two figures are equidistant from the y-axis. For example, point A in figure U is the same distance away from the y-axis as point A' in figure V.
The corresponding points of the two figures are on opposite sides of the y-axis. For example, point B in figure U is to the left of the y-axis, while point B' in figure V is to the right of the y-axis.
The shapes of the two figures are the same. Figure U is a triangle, and figure V is also a triangle.
Therefore, based on the properties of reflections, we can conclude that figure V is a reflection of figure U across the y-axis.