Question

Which expression represents a rational number?

Answer 1

Answer:

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

Step-by-step explanation:

Given: expressions

To find: expression that denotes a rational number

Solution:

A number of the form $\frac{p}{q}$ where p and q are integers and $q\neq 0$ is said to be a rational number.

Sum of a rational and irrational number is irrational.

In $\frac{5}{9}+\sqrt{18}$, $\frac{5}{9}$ is a rational number and $\sqrt{18}$ is an irrational number

So, $\frac{5}{9}+\sqrt{18}$ is not a rational number.

In $\pi+\sqrt{16}=\pi+4$, $\pi$ is an irrational number and 4 is a rational number

So, $\pi+\sqrt{16}$  is not a rational number.

In $\frac{2}{7}+\sqrt{121}=\frac{2}{7}+11=\frac{2+77}{7}=\frac{79}{7}$, $\frac{79}{7}$ is a rational number

So, $\frac{2}{7}+\sqrt{121}$  is a rational number

In $\frac{3}{10}+\sqrt{11}$, $\frac{3}{10}$ is a rational number and $\sqrt{11}$ is an irrational number

So, $\frac{3}{10}+\sqrt{11}$ is not a rational number.

Answer 2

Answer:

2 / 7 + 12

Step-by-step explanation:

he is right i  just took the test i just wanna help more ..