On the number line shown, which one of the marked numbers is irrational? 
A$-2.3$
B$0.6$
C$\sqrt{2}$
DAll three are irrational
Answer & Solution
Correct answer: C. $\sqrt{2}$
$-2.3$ and $0.6$ are terminating decimals, so they are rational numbers. $\sqrt{2}$ is a non-terminating, non-recurring decimal, so it is irrational. Hence only $\sqrt{2}$ is irrational.
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