-4.2 is a negative decimal number. It is also a directed number.
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Rational (ℚ) which is a subset of Real (ℝ) which is a subset of Complex (ℂ).
Irrational Numbers which are a subset of Real Numbers which are a subset of Complex Numbers ...
I'm just telling you this ahead of time...but i'm not 100% sure with this answer..: fractions belong in the Rational Numbers
Yes. '7 squared' means 7 x 7, which equals 49.