Final answer:
In roulette, the two green figures that contribute to a U.S. casino's profits are the numbers 0 and 00. They provide the house edge as bets on these numbers result in losses for the other outside bets.
Step-by-step explanation:
The U.S. casino's ability to make money on roulette relies on the presence of the two green figures, which are the numbers 0 and 00. These numbers are what give the house its edge in the game. If a player bets on red, black, even, or odd, a ball landing on 0 or 00 means the house wins and the player's bet is lost. The presence of these two numbers on the roulette wheel makes the odds of winning slightly less than 50/50 for those outside bets, resulting in a higher chance for the casino to make money.