Volume of 10 coin is 25ml what is the volume of 1 coin

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.

The ozone hole appears in antarctica during

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?