Question

Determine for each number whether it is irrational or rational number.


`(1)/(2)`


`( √(7) )/(10)`


`(3\pi)/(4)`


`(5)/(9)`


`18`

Answer 1

rational numbers can be written as a ratio of two integers a/b

1/2 is the ratio of 1 and 2 so its rational

√7/10 is not a ratio of two integers so its irrational

3π/4 is not a ratio of two integers so its irrational

5/9 is the ratio of 5 and 9 so its rational

18 is 18/1 and is the ratio of 18 and 1 so its rational