Answer:
In the North, the expansion of cities occurred as working-class people moved to urban areas to search for employment in industrial factories and textile mills. In the South, the agricultural economy, particularly in the production of cotton for the creation of textiles, experienced a marked increase.
Critical air pollution and decrease of oil
You can use substitution method
x - y = 7
(x+y)^2=289
So
Since the square of their sum is 298, their sum without being squared is the square root of 289.
Hence,
x - y = 7
x + y = 17
By subtracting you get the following:
= (0) -2(y)=-10
So -2y=-10
y=-10/-2
y=5
Now, plug in y in both equations to get x
x - (5) = 7
x + (5) = 17
Multiply each equation with its opposite y variables
(5) x - (5) = 7
(-5) x + (5) = 17
= 5x -25 = 35
-5x -25 = -85
Now subtract the equations
= 10x + (0) = 120
10x = 120
x = 120/10
x = 12
It means they had highly advanced infrastructure for their time. It's worth noting that major cities like New York use very similar grid like patterns for their layout still today, in 2016.
The government document that served as the colonies' central legal document was the Declaration of Independence in 1776.
