Which of the following is true about -9?

Question

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It is a whole number but not an integer.
It is an integer but not a whole number.
It is an integer but not a rational number.
It is both an integer and a whole number.

Answer 1

The correct statement about -9 is: It is an integer but not a whole number.

Here's why:

• Whole numbers are non-negative integers (0, 1, 2, 3, ...), which means they do not include negative numbers.
• Integers include all whole numbers and their negative counterparts (..., -3, -2, -1, 0, 1, 2, 3, ...), so -9 is indeed an integer.
• Rational numbers include all integers, so -9 is also a rational number, but the relevant truth here pertains to its classification as whole and integers.

Thus, the first two statements are false, while the last one is also false because -9 is not a whole number, just an integer.