For a wrestler to qualify in his weight class, he needs to weigh more than 165 pounds but less than or equal to 185 pounds. He currenty weighs 189 pounds and is losing 0.5 of a pound per week.
C
165 > 189 – 0.5w or 185 ≤ 189 – 0.5wD
165 ≥ 189 – 0.5w or 185 < 189 – 0.5w