Final answer:
The number -9.75 belongs to the set of Rational Numbers and the set of Integers.
Step-by-step explanation:
The number -9.75 belongs to the set of Rational Numbers and the set of Integers.
Rational Numbers: A rational number is any number that can be expressed as a fraction, where the numerator and denominator are integers. In this case, -9.75 can be written as -39/4, which is a fraction where the numerator and denominator are both integers. Therefore, -9.75 is a rational number.
Integers: Integers are the set of whole numbers and their opposites (negative whole numbers). Since -9.75 is a negative whole number, it is an integer.