A reflection.
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A reflection in math is when a shape is flipped over the x or y axis by counting how many units the points are away from the axis and putting the point on the other side the same distance away. Shapes which are reflections are labeled with a '. Example: Shape ABC was reflected over the x axis to create shape A'B'C'.
You draw it. Or you can use the Math Input Panel (in start menu) to draw a line with numbers underneath.
periodic line
A bar.
Plus + minus - Times * or X Divide one line and 2 dots over and under the line (almost like a fraction)