Triple Integrals Help Suppose $E$ is the sphere $x^2 + y^2 + z^2 = 1$ whose density at each point is proportional to the distance from the origin. Find an expression for the mass of $E$ as a Triple Integral and explain why it's difficult to compute
I believe it is difficult to compute because the region is a sphere and not a box but I'm not exactly sure how to write the triple integral

Hint:
If $\delta=kr$ is the density at distance $r$ from the center, than the mass of a spherical shell from $r$ and $r+dr$ is $m=\delta 4 \pi r^2 dr$.
Can you do from this?
