Find the Average Rate of Change for the Function Between $f ( x ) = \sqrt { 2 x }$

Multiple Choice

Find the average rate of change for the function between the given values.
- $f ( x ) = \sqrt { 2 x }$ ; from 2 to 8

A) $\frac { 1 } { 3 }$
B) 7
C) $- \frac { 3 } { 10 }$
D) 2