What are the coordinates of the image of vertex p after a reflection of rx-axis(x, y)? p'( , )

(x , -y)

Explanation:
To get the coordinates of a point reflected on the x-axis, you must follow the following rules:
1- the x-coordinate of the reflected point is the same as the x-coordinate of the original point
2- the y-coordinate of the reflected point has the same value but opposite sign of the y-coordinate of the original point

Examples:
point (2,5) when reflected on the x-axis will be (2,-5)
point (-3,-7) when reflected on the x-axis will be (-3,7)
point (9,-12) when reflected on the x-axis will be (9,12)

Hope this helps :)

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