Answer:
A''(3, 2)
Explanation:
The given sequence seems to* shorten to ...
(x, y) ⇒ (x -3, -y+4)
Then
A(6, 2) ⇒ A''(3, 2)
_____
We have interpreted the "sequence of transformations" to be ...
(x, y) ⇒ (x, -y)
followed by
(x, y) ⇒ (x-3, y+4)
with the net effect that (x, y) ⇒ (x-3, -y+4).
If the second transformation is really another reflection, ...
(x, -y) ⇒ (x-3, y+4)
then the net effect is (x, y) ⇒ (y+4) and A(6, 2) ⇒ A''(3, 6)