Find the Function Value $f ( x ) = \left( \frac { 1 } { 6 } \right) ^ { x }$

Multiple Choice

Find the function value.
-Let $f ( x ) = \left( \frac { 1 } { 6 } \right) ^ { x }$ . Find $f ( - 2 )$ .

A) $\frac { 1 } { 36 }$
B) $- \frac { 1 } { 36 }$
C) 36
D) $- 12$