18. Which is the graph of f-1(x)?
A.
8
7
6
5
4
3
B.
-5-4-3-2-10 1 2 3 4 5 6 7
C.
-7-6-5-4-3-2-10 245
-2
132-
-1-
-1 0 1
2 3
4
5 6 7 8
-4
-5
23455
-2
-3
D.
-6
1
-5-4-2-10 1 2 3 4 5 6 7
-1-
-3
-4
-5
-6
-7
-8-
-4
5
-6
-7
.8