Question

Which of the following describe -9? Select all that apply.

rational number
whole number
integer
irrational number

Answer 1

-9 is a rational number and an integer.

Explanation:

A rational number is any number that can be expressed as a fraction. -9 can be written as
`-(9)/(1)`, thus it is a rational number.

A whole number is a number that is not negative and does not have fractions or decimals. -9 is negative, thus it is not a whole number.

An integer is a number with no fractions or decimals, but it can be negative or positive. -9 meets these requirements, thus it is an integer.

An irrational number is a number that cannot be written as a fraction. Irrational numbers are not rational. Thus, -9 is not an irrational number.

So, -9 is a rational number and an integer.