Find the Average Rate of Change of the Function Over $y = x ^ { 2 } + 4 x , [ 4,7 ]$

Multiple Choice

Find the average rate of change of the function over the given interval.
- $y = x ^ { 2 } + 4 x , [ 4,7 ]$

A) 15
B) $\frac { 45 } { 7 }$
C) 11
D) $\frac { 77 } { 3 }$