The real number that should be subtracted from - 5 to get 0 is -5 (option b).
A real number is a quantity that can be written as an infinite decimal expansion. A real number is made up of both rational numbers and irrational numbers.
Rational numbers are numbers that can be expressed as a fraction of two integers. An example is 5, -5. Irrational numbers cannot be expressed as a fraction of two integers. An example is 22/7, 1/3.
In mathematics, the following rules exist:
-5 - (-5)
= -5 + 5
= 0
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