Three standard units of the metric system are
Length: Meters
Volume: Liters
Mass: Grams
Explore new food and material source. Conquest.
Answer:
C. Philip Johnston
Explanation:
Philip Johnston proposed the idea of using the Navajo language as a Navajo code to be used in the Pacific during World War II
The primary positive effect of the Columbian exchange was the introduction of New World crops, such as potatoes and corn, to the old world.
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Explanation:
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The Columbian exchange is considered to be the most important during the modernisation period where the varied variety of new types of crops grown and largely it catered the entire need of the new world.
The crops like potatoes and corn are grown and it is particularly benefited the European people. What made it harmful was large number of African population has been migrated to their places as slaves to work in their agricultural fields.
This migration of workers has led to the spread of diseases such as smallpox, measles, chickenpox, influenza, malaria, and yellow fever. The American native’s immune is not that strong as Europeans, so the native peoples were greatly affected by the diseases.
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