Question

Is -11.5 a real number

Answer 1

yes.

Answer 2

an imaginary or complex number would be something like 4i
i = \[\sqrt{1}\]

Answer 3

Is -2 a real number

Answer 4

yes

Answer 5

Any number is real unless it an i (for example: 4i). Even if it is negative, a fraction or a decimal it is real.