Answer:
[tex]\sqrt{10}[/tex]
Step-by-step explanation:
An irrational number can't be written as a simple fraction or ratio.
Therefore, the expressions 8/5, [tex]\sqrt{4}[/tex], and [tex]\sqrt{64}[/tex] are rational.
Why?
This is because 8/5 = 1.6, [tex]\sqrt{4}[/tex] = 2, and [tex]\sqrt{64}[/tex] = 8. Since all of the expressions can be simplified to set numbers (that can then be converted to fractions or ratios) the answer is [tex]\sqrt{10}[/tex].
