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The question cannot be answered since it is inconsistent. It first states that AB equals 5 cm and then AB equals 6 cm. Please check your typing and resubmit.
If a, b, c and d are all non-zero then ab = CD if and only if a/c = d/b or (equivalently) a/d = b/c
5.3 = 2x so x = 5.3/2 = 2.65
The existence of the additive inverse (of ab).
In Roman numerals C = 100 and D = 500. The combination CD literally means 100 before 500, which is 400. I equals 1 and III equals 3. So CDIII equals 403.