Find the Function Value $f ( x ) = 2 ^ { x }$

Multiple Choice

Find the function value. If the result is irrational, round your answer to the nearest thousandth.
-Let $f ( x ) = 2 ^ { x }$ . Find $f ( 2.28 )$ .

A) $7.286$
B) $9.714$
C) $4.857$
D) $4.56$