In general, what is a developing nation?

A developing country is a country with a less developed industrial base and a low Human Development Index relative to other countries. However, this definition is not universally agreed upon. There is also no clear agreement on which countries fit this category.

A nation where the average income is much lower than in industrial nations, where the economy relies on a few export crops, and where farming is conducted by primitive methods.

Explanation:

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answer; european crusades;

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)