A complex number is denoted by Z=X+iY, where X is the real part and iY is the
imanginary part. So the number 4 would be 4+i0 and is the real part of a complex
number and so 4 by itself is just a real number, not complex.
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No. Negative four is a real number. All real numbers are also complex numbers, so it is a complex number (but it's real, not nonreal)
-4=4ei*pi
The number -4 belongs to the set of all integers. It also belongs to the rationals, reals, complex numbers.
31
The absolute value of a complex number is the magnitude of the number, which is found from sqrt(a² + b²) for the complex number a + bi