The Mass of a Rod Varies in Such a Way $x ^ { 2 }$

Multiple Choice

The mass of a rod varies in such a way that the mass of a piece x meters long, measured from the left end, is $x ^ { 2 }$ kilograms. Find the density in kg/m at the point 2 meters from the left end.

A) 1
B) 5
C) 3
D) 4
E) 7
F) 6
G) 2
H) 8