Which of the following is true about -9?
A. If is an integer but not a rational number.
B. It is a while number but not an integer.
C. It is an integer but not a whole number.
D. It is both an integer and a whole number.
D. It is both an integer and a whole number.
The correct answer is C. It is an integer but not a whole number.
Explanation:
-9 is an integer because it is a whole number that can be expressed without a fraction or decimal. However, it is not a whole number because whole numbers include 0 and all positive integers, but exclude negative integers like -9.