Elli says 3 + (x + 1) is equivalent to (3 + x) + 1. Gabe says 3 + (x + 1) is equivalent to 3+ (1 + x).
Who is correct and what property did they use?

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b.you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c.you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d.you spend $5 plus $10 per week until you have less than $45.