Mathematics: ERGENTWhich expression represents a rational number?

answer: step-by-step explanation: for the size of the school because there is no clustersoption...

ERGENTWhich expression represents a rational number?

helpmeplzz27

13.02.2022

$\frac{2}{7}+\sqrt{121}$

Step-by-step explanation:

Rational Numbers

Rational numbers are those that can be expressed as the fraction

$\frac{a}{b}$

where a and b are integers and b≠0.

Examples of rational numbers are:

4/3, -100/34, 9, -5, 0

Note the last three numbers are integers but they also can be called rationals because they can be written as 9/1, -5/1, 0/1.

Irrationals are those numbers that cannot be expressed as fractions, i.e. they are not rationals.

Examples of irrational numbers are:

$2\pi,\ \sqrt{5}, \sin 4^\circ$

Analyzing the available options:

$\sqrt{18}$ is not a rational number because the value of the root is not exact

π and $\sqrt{11}$ are not rational numbers either, but $\sqrt{121}=11$ .

Thus the only rational number from the list is

$\mathbf{\frac{2}{7}+\sqrt{121}}$

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