Find the Average Rate of Change for the Function Between $f ( x ) = x ^ { 2 } + 6 x ;$

Multiple Choice

Find the average rate of change for the function between the given values.
- $f ( x ) = x ^ { 2 } + 6 x ;$ from 3 to 7

A) $\frac { 91 } { 4 }$
B) $\frac { 64 } { 7 }$
C) 13
D) 16