Evaluate the Definite Integral $\int _ {3}^{ 7 } \frac { 4 } { u ^ { 3 } } d u$

Multiple Choice

Evaluate the definite integral
$\int _ {3}^{ 7 } \frac { 4 } { u ^ { 3 } } d u$ . Use a graphing utility to verify your results.

A) $\frac { 40 } { 1,323 }$
B) $\frac { 160 } { 1,323 }$
C) $\frac { 20 } { 441 }$
D) $\frac { 80 } { 441 }$
E) $\frac { 160 } { 441 }$