How did vertical integration the carnegie steel business?

it reduced the costs along the supply chain, from mining to transportation to manufacturing.
it gave the company a monopoly on the industry because it eventually owned its competitors.
it assigned one worker to a job, which reduce wasted time and speed manufacturing.
it provided quick and easy access to transportation methods, such as canals, rivers, and railways.

"Vertical integration helped the Carnegie Steel business because it reduced costs along the supply chain from mining and transportation to manufacturing. Carnegie bought out coal fields, iron mines and railroad lines to ensure that he could control the raw materials and transportation lines."

- Another Brainlier (not my answer, but I do think this will help you. Credit to the sources.)

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: