Final answer:
-45 belongs to several subsets of real numbers, including the integer, negative numbers, and rational numbers categories.
Step-by-step explanation:
The number -45 belongs to several subsets of the real number set. These sets include: integer (because -45 has no fractional or decimal part), negative numbers (for values less than 0), and rational numbers (because -45 can be expressed as a fraction, such as -45/1). Hence, when categorizing -45 within the subsets of real numbers, it fits into these categories.
Learn more about Subsets of Real Numbers