Answer:
π/2 and ³√4
also -4.8237 and π/2
Explanation:
number 2 and 4 are automatically out since every integer is a rational number.
√25 = 5 and 5 + 4 = 9, 9 can be expressed as 9/1 which falls under rational numbers.
π/2 on the other hand is not rational same goes for -4.8237 and ³√4 because these numbers cannot be written as a fraction with integers.
for the above numbers π/4 and ³√9 are irrational.