Find out 7 5 is a rational or irrational number.

Rational number is a number which can be represented in the form of p q , where q ≠ 0 . An irrational number is a real number that cannot be expressed as a ratio of integers. Here, we have 7 5 We know that 7 is an integer number but 5 is not an integer number. So, the number 7 5 can not be expressed in the form p q . Therefore, 7 5 is an irrational number.

Find out 2 + 21 is a rational or irrational number.

Rational number is a number which can be represented in the form of p q , where q ≠ 0 . An irrational number is a real number that cannot be expressed as a ratio of integers. Here, we have 2 + 21 We know that 21 is a rational number but 2 is an irrational number. The sum of a rational number and an irrational number is irrational. Therefore, 2 + 21 is an irrational number.