Simplify:
$\frac{x^2-y^2}{x+y}$
$x-y,\ x+y$
x+y
2xy
x-y
1
If the function h(x) is created by shifting f(x) up four units and then reflecting it across the x-axis, which of the following represents h(x) in terms of f(x)?
f(x-4)
f(x+4)
f(x)+4
-f(x)-4
-f(x+4)
