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I do not understand the first

I do not understand the first-example-1

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Answer:

√121 - rational

√2 - irrational

π - irrational

√50 - rational

1.3 - rational

3/7 - rational

0.27 - rational

Explanation:

A number is considered rational if it can be written as the ratio of two integers (i.e., a fraction), and it is considered irrational if it cannot be written as a ratio of two integers. In the given list, √121, √50, and 1.3 are all rational numbers because they can be written as fractions (√121 = 11/3, √50 = 5/2, and 1.3 = 13/10), while √2, π, and 0.27 are irrational numbers because they cannot be written as fractions. Note that 3/7 is also a rational number because it is a fraction with an integer numerator and an integer denominator.

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