Use a Double Integral to Find the Area of the Region

Multiple Choice

Use a double integral to find the area of the region bounded by the graphs of $y = x ^ { 13 / 2 }$ and $y = x$ .

A) $2$
B) $11$
C) $\frac { 13 } { 2 }$
D) $\frac { 13 } { 15 }$
E) $\frac { 11 } { 30 }$