Question

which figure appears to be correctly marked with a line of symmetry? four figures with dashed lines are shown

Explanation:

A line of symmetry divides a figure into two mirror-image halves.

1. For the top-right figure: The wavy edges are not mirrored across the horizontal line, so it is not a line of symmetry.
2. For the bottom-right figure: A parallelogram's diagonal does not create mirror-image halves, so it is not a line of symmetry.
3. For the bottom-left figure: The dashed line does not split the shape into matching mirror halves.
4. For the top-left figure: The vertical dashed line splits the shape into two identical mirror-image parts.

Answer:

The top-left figure (the T-shaped figure with the vertical dashed line) is correctly marked with a line of symmetry.