PDF chapter test TRY NOW

Find which of the variables x, y, z and u represent rational numbers and which irrational numbers :
 
(i) x^2 = 5 is
 
(ii) y^2 = 9 is
 
(iii) z^2 = .04 is
 
(iv) u^2=\frac{17}{4} is
Answer variants:
a rational number
an irrational number