What do you notice about the opposite sides?
Remember that reflect means to 'flip.' If you were to flip the quadrilateral across the x-axis, where would each point end up? Plot points A', B', C', and D' below (the x-axis) to where you think they should end up.
Use eTool below to plot the points, and complete the rest of the problem.
Click the link at right for the full version of the eTool: MC2 2-132 HW eTool