Consider the function f(x). Select all of the following that include a vertical stretch of f(x).
-2f(x)
0.25f(x)
-f(x) +6
5.5f(x) - 1
f(x) +9
7f(x)
-2f(x)
0.25f(x)
5.5f(x) - 1
7f(x)
-2f(x)
0.25f(x)
-f(x) +6
5.5f(x) - 1
f(x) +9
7f(x)
0.25f(x)
5.5f(x) - 1
7f(x)