Consider the function f(x). Select all of the following that include a horizontal compression of f(x).
2f(x)
f(3x)
-f(x) + 1
f(0.4x)-1
f(6x) + 9
-f(0.12x)
2f(x)
f(3x)
f(6x) + 9
2f(x)
f(3x)
-f(x) + 1
f(0.4x)-1
f(6x) + 9
-f(0.12x)
f(3x)
f(6x) + 9