Step 1
All integers are rational numbers. All integers are subset of rational number.
Rational numbers are numbers that can be express as fraction
Inteers are both positive and negative natural numbers.
Therefore,
6/2 = 3 is an integer
-4.0 is a negative integer
-15/3 = -5 is a negative integer
7.5 is a rational number but not an integer.
Hence, 7.5 DOES NOT BELONG TO THE SUBSET OF INTEGERS