Final answer:
Among the given options, only b. -81879 is an integer because it's a whole number without any fractional or decimal parts. Options a, c, and d are not integers as they are either imaginary, decimal, or irrational numbers.
Step-by-step explanation:
To determine which of the following are integers, let's examine each option:
- a. √-9: The square root of a negative number is not a real number, and since integers are a subset of real numbers, this is not an integer. The square root of -9 is an imaginary number.
- b. -81879: This is a negative whole number without any fractional or decimal parts, so it is indeed an integer.
- c. 8.97: This is a decimal number, not a whole number, so it is not an integer.
- d. -√6: The square root of 6 is not a whole number; it's an irrational number. When negated, it remains a non-integer. Therefore, this is not an integer.
The only option that is an integer is b. -81879.