20 points which of the following was not a factor in the growth of huge steel empires after the civil war?
a.
the railroads’ need for strong, durable rails
b.
the cost-cutting benefits of the bessemer process
c.
the growing popularity of skyscrapers in big cities
d.
the development of a less-polluting manufacturing process

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.