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

14 pointslet x be the seats in the small van and y the seats in the large van. how many seats does the large van have? a company uses two vans to transport worker from a free parking lot to the workplace between 7: 00 and 9: 00a.m. one van has 9 more seats than the other. the smaller van makes two trips every morning while the larger one makes only one trip. the two vans can transport 69 people, maximum.how many seats does the larger van have?

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.

Point q is equidistant from the sides of ∠tsr. find m∠rst.