The point (2.1.-3.5) is reflected over the x-axis, what is the coordinate of that
point of reflection?

Answer:
2nd answer, (2.1,3.5)
Step-by-step explanation:
Reflection over x axis rule:
(x,-y) Change the sign of the y coordinate.
So we basically change the sign of the y axis (-3.5) to get (3.5).
Very much simple and I hope it helps.