If $f ( x ) = \frac { x } { x + 3 }$

Multiple Choice

If $f ( x ) = \frac { x } { x + 3 }$ , find $f ( s )$ .

A) $f ( s ) = \frac { 3 } { s + 3 }$
B) $f ( s ) = \frac { s } { x + 3 }$
C) $f ( s ) = \frac { s } { s - 3 }$
D) $f ( s ) = \frac { x } { s + 3 }$
E) $f ( s ) = \frac { s } { s + 3 }$