<u>Given</u>:
Given that the coordinates of the trapezoid ABCD.
The coordinates are A(2,2), B(7,2), C(5,1) and D(3,1)
Also, given that the trapezoid is reflected across the x - axis.
We need to determine the coordinates of the point B' after the reflection across the x - axis.
<u>Coordinates of the point B':</u>
The general rule to reflect the point across the x - axis is given by
![(x,y) \implies (x,-y)](https://tex.z-dn.net/?f=%28x%2Cy%29%20%5Cimplies%20%28x%2C-y%29)
Substituting the coordinate (7,2) in the above general rule, we get;
![(7,2) \implies (7,-2)](https://tex.z-dn.net/?f=%287%2C2%29%20%5Cimplies%20%287%2C-2%29)
Thus, the coordinate of the point B' after the reflection across the x - axis is (7,-2)
Hence, Option c is the correct answer.