Answer:
It is contained in the set of natural numbers, whole numbers, integers, and rational numbers, but it is not contained in the set of irrational numbers.
Step-by-step explanation:
The given number can be expressed as:
[tex]\frac{30}{2} = 15[/tex]
Then is contained in all the set an exception of irrational and complex numbers.
The set of natural numbers is:
[tex]\mathbb{N} = \{1,2,3,\cdot \cdot \cdot \infty\}[/tex]
Then 15 [tex]\in \mathbb{N}[/tex]
The set of whole number is the same but with 0, then also is inside that set.
The set of integers is:
[tex]\mathbb{Z} = \{ -\infty, \cdot \cdot \cdot, -2,-1,0,1,2,\cdot \cdot \cdot ,\infty\}[/tex]
And at the same time contain the set of whole and natural numbers then 15 is also in the integers.
And the set of rational numbers is:
[tex]\mathbb{Q} = \{ -\infty, \cdot \cdot \cdot, -2, -1,-\frac{1}{2},0,\frac{1}{2} , 1,2,\cdot \cdot \cdot ,\infty\}[/tex]
And at the same time contain the set of whole, natural numbers and integers then 15 is also in the rational numbers.
Now 15 is not an irrational number because don't have a infinity growth of numbers after the decimal point and neither complex because isn't in the options.
