How did railroads help define the era and benefit the nation? They united the country by making tariffs profitable for each region: North, South, and West.

They helped create one integrated economy, moving raw materials from farms in the North to factories in the South.

They were used to ship goods and crops across the nation and helped achieve unprecedented growth.

They strengthened democracy in the United States by making election results known in a timelier manner.

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Drag each tile into the correct box. not all tiles will be used. find the tables with unit rates greater than the unit rate in the graph. then tenge these tables in order from least to greatest unit rate

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.