You can write two inequalities:
-6 < x and x < 6
This is often combined as follows:
-6 < x < 6
(You can also use less-than-or-equal, but I don't know how to use the symbol here.)
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A real number is a rational number.Different types of real numbersNatural numbers: These are numbers that have no decimal.Whole numbers: These are positive and no decimals, and also zero. Natural numbers are whole numbers.Integers: These are numbers that have no decimals. These include both positive and negative numbers. Whole numbers are integers.Rational numbers: These are numbers that can be written down as fractions of integers. Integers are rational numbers.Transcendental numbersIrrational numbers: These are numbers that cannot write as fraction of integers.
Yes, all natural numbers are real numbers. Natural numbers are a subset of real numbers, so not all real numbers are natural numbers.
All rational numbers are real numbers.
Complex numbers are a proper superset of real numbers. That is to say, real numbers are a proper subset of complex numbers.
Real Numbers cannot be the square root of a negative number. Real Numbers are not divided by zero. Basically, Real Numbers cannot be anything that is undefined.