Find the common difference between consecutive terms.<br><br>&bull; 3500 − 3900 = −400<br>&bull; The pattern decreases by 400 each step.<br>&bull; First blank: 3100 − 400 = 2700<br>&bull; Second blank: 2700 − 400 = 2300<br>&bull; Third blank: 2300 − 400 = 1900<br><br>Final Answer: 2700, 2300, 1900