Question

Which elements in the set below are integers? –3, 3.7, √ 81 , –7.34, √ 8 , 5, 56⁄7, –1 A. –3, √ 81 , 5, 56⁄7, –1 B. 3.7,√ 81 , √ 8 , 5, 56⁄7 C. –3, 3.7, –7.34, –1 D. 3.7, –7.34, √ 8

Answer 1

A

Explanation:

–3, √ 81 , 5, 56⁄7

Answer 2

The answer is: A. –3,
`√(81)`, 5,
`(56)/(7)`.

The explanation is shown below:

1) By definition, the integers include whole numbers, negative numbers and zero.

2) Therefore, keeping this information on mind, you have that:

-3 is a negative number without decimal part, therefore, it is an integer.

3.7 is decimal number, so it is not an integer.

`√(81)=9` (It is a whole number, therefore, it is an integer).

-7.34 is a decimal number, so it is not an integer.

`√(8)=2.828` is an irrational number. It is not an integer.

5 is a whole number, therefore, it is a integer.

`(56)/(7)=8` (It is a whole number, then, it is an integer).