Answer:
201 countries
Explanation:
There are 195 countries in the World, 54 countries is Africa, which is 249 countries. Then 48 countries is Asia, so 201 countries.
The matrix is a 2 by 2 matrix, and the determinant of the matrix by hand is -3
<h3>How to determine the determinant?</h3>
The matrix is given as:
1 2
2 1
The determinant of the matrix is calculated using the following product expression
det |A| = 1 * 1 - 2 * 2
Evaluate the product
det |A| = 1 - 4
Evaluate the difference
det |A| = -3
Hence, the determinant of the matrix by hand is -3
Read more about matrix at:
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An example of 17.3 subtracting polynomial expressions question is solve for 2q² - q - 8) - (2 q² + q - 4).
<h3>What is polynomial expressions?</h3>
A polynomial is known to be a type of an expression that is made up of variables, constants and exponents. They are often combined using the mathematical terms such as addition, subtraction, etc.
2 q² - q - 8) - (2 q² + q - 4)
= (2 q² - q - 8) + (-2 q² - q + 4)
Then you have to rewrite subtraction as addition and then Group like terms together;
= (2 q² - 2 q²) + (-q - q) + (-8 + 4)
= -2q - 4
Learn more about polynomial from
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