753,249 - 575,388 = 159,861
i hope it's right :)
The answer would be the first choice. When you reflect a shape across the x-axis, the y coordinates of every points/vertices become of the opposite of what they usually were.
For example, the y coordinate in (1, -5) {{-5 being the y coordinate) once reflected upon the x axis would be (1, 5).
On the other hand, if the y coordinate were positive it would become negative.
F(1) = -2 and g(4) = 6
-8 • -2 - 4 • 6
16 - 24 = -8