Line segment ef is shown on a coordinate grid:
the line segment is reflected about the x-axis to form e'f'. which statement describes e'f'?
e'f and ef are equal in legnth
e'f is half the legnth of ef
e'f is greater than twice the legnth of ef
e'f and ef are perpendicular

The answer would be A.

It is reflected across the x-axis means that point E' will be at (-3, -2) and point F' would be at (-1,-2)

the length of the line would be the same regardless of anyway you translate, rotate, or reflect it. Only if you dilate it, then an object's size can change.

Hope that helps :)

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