How do you report hours that vary week to week? - 19 weeks in

I work some days through a staffing agency while still certifying. I am in Albuquerque, in case local advice matters. Pay posts on a different day from when I work. Who can I ask without risking my claim?

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.

I estimated and then checked my pay stub. When there was a small difference I wrote to the agency to correct it.