Answer: A(1,-1) , B(7,0) , C(10,-10)
Using a graph would make it easier to visualize and solve, but here is how you can solve this question without using a graph.
When something is reflected over the x-axis, it's y value stays the same, but the sign on front of the x value changes.
A (-1,-1) would be (1,-1) when reflected over the x axis.
B (-7,0) would be (7,0),
C (-10,-10) would be (10,-10).