To show that the triangle in Quadrant IV is congruent to the triangle in Quadrant II, the correct sequence of steps is reflection, then translation.
- Reflection: Reflect the triangle in Quadrant IV across the y-axis to move it to the corresponding position relative to Quadrant II.
- Translation: Shift (translate) the reflected triangle to align it with the triangle in Quadrant II.
Thus, the answer is: reflection, then translation.