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Examples of the real numbers

Is 216\sqrt{216}  a real number ? 

Is 0 a real number ? 

Is 5.5 a real number ? 

Is 318-3\frac{1}{8} a real number ? 

Is 3π-3\pi  a real number ? 

Is 712\frac{7}{12}  a real number ? 

Is 2π2\pi a real number ? 

. Is 8\sqrt{8}  a real number ? 

Is 0.50505050... a real number ? 

Is 72\sqrt{72} a real number ?