Is united states currency officially "backed" today? (1 point)

It is 1902 i make 45,000 per year how much do i owe in federal income taxes

Plz 50 points answer only if you know and dont copy from others draw conclusion explain how trade in the east african city-states resulted in a blending of cultures. provide examples

Plz the 10 places that charles darwin stopped at to report his findings, and include dates?