Answer: 12
Explanation:
The closure property in mathematics implies that when you perform an operation on two numbers within a set, the result is also a member of that same set.
In this case, when you multiply 4/5 and 15:
(4/5) * 15 = (4 * 15) / 5 = 60/5 = 12
The result, 12, is a rational number because it can be expressed as a ratio of two integers (12/1). So, the product of 4/5 and 15 is a rational number.