There is no first real number. If x laid claim to being the smallest real number, then x/2 would have a better claim. And so on.
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The standard written form of a complex number is to first write the real part of the number, and then write the imaginary part; e.g. x+yi or 3+7i.
The square of a real number is always a real number.
thus number is not a real roman numeral number. The higher value is always first
Yes, zero is a real number. It is not a counting number, but it is an integer, a rational number, and a real number.
Of course, not only can it be a real number but it is a real number. When you take the square root times itself, the result is a number that is real.