Let's evaluate each statement one by one:
-
-9 is a whole number.
False - Whole numbers are non-negative integers (0, 1, 2, ...), and -9 is a negative integer. -
23 is a rational number.
True - Rational numbers are numbers that can be expressed as a fraction (where the numerator and denominator are integers, and the denominator is not zero). Since 23 can be expressed as 23/1, it is a rational number. -
64−−√ is a rational number.
True - The square root of 64 is 8, which is a rational number. -
0 is a natural number.
False - In most definitions, natural numbers start from 1 (1, 2, 3, ...). Some definitions may include 0, but the more commonly accepted definition does not. -
π is an irrational number.
True - π (pi) cannot be expressed as a fraction of two integers, making it an irrational number.
In summary:
- -9 is a whole number. - False
- 23 is a rational number. - True
- 64−−√ is a rational number. - True
- 0 is a natural number. - False
- π is an irrational number. - True