A real number is a number that does not have an imaginary component. There is no imaginary component in -17, so it is a real number.
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An "imaginary" number. Those number are called imaginary for historical reasons, but they have very "real" practical applications. The result is written as root(17)i (replace root(17) with the square root symbol).
It is a real number, but it is not a whole number
No, 8.5 is a rational number. A rational number is defined as any number that can be expressed as a fraction. 8.5 can be expressed as 8 1/2 or 17/2.
17+17+17=51
17 is the absolute value of -17, that is, the value of the number without the negative number sign.