11. We are trying to find the minimum amount of chocolate she needs.
12. The variable could be any letter, but we can use c. I think the label is lbs., but I'm not 100% sure.
13. The inequality is 8 + c ≥ 15, since the regular 8 and the addition should be greater than the minimum, 15.
14. Work: 8 + c ≥ 15 -> c ≥ 15 - 8 -> c ≥ 7
15. c ≥ 7 lbs.