The reflection over the y-axis is the transformation
(x, y) ⇒ (-x, y)
Translation to the right 3 units is the transformation
(x, y) ⇒ (x+3, y)
After both transformations, you have
(x, y) ⇒ (-x+3, y)
Then the point (-4, -4) becomes (-(-4)+3, -4) = (7, -4).