Answer:
rational: √81, √121
irrational: √89, √131
Explanation:
You know your squares, so you know that 81 = 9² is a perfect square. Its square root is 9, a rational number.
And you know that 121 = 11², another perfect square. Its square root is 11, a rational number.
The remaining numbers are not the roots of squares of integers, so will be irrational.