Final answer:
The number -27 has one real 3rd root, which is -3. Although technically, there are also two complex 3rd roots of -27, the real root is commonly the one referred to.
Step-by-step explanation:
The number -27 has exactly one real 3rd root. In mathematics, every real number has a unique real cube root. To find the 3rd root of -27, you would look for a number that when multiplied by itself three times equals -27. The real 3rd root of -27 is -3, since (-3) × (-3) × (-3) = -27. However, if we consider complex numbers, -27 has three distinct 3rd roots, one real and two complex. But typically, when asked for the cube root, unless specified, we refer to the real root.