PDF chapter test TRY NOW

Classify the following numbers as rational or irrational.
 
(i) \(2-\sqrt{5}\)
 
(ii) \((3+\sqrt{23})-\sqrt{23}\)
 
(iii) \(\frac{2\sqrt{7}}{7\sqrt{7}\)
 
(iv) \(\frac{1}{\sqrt{4}\)
 
(v) \(2\pi\)
Answer variants:
is an irrational number
is a rational number