What is the unit of joule and cubic meter in derived unit

Find the volume of the ellipsoid x^2+y^2+5z^2=36.

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

How do you tell if someone actually cares about you? and just say they do?