Expand the expression and combine like terms: 2(−14+r)−(−3r−5)

Chemistry balance then what type of reaction are they i don't know why it keeps saying math when i put chem

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.

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*