Select the correct description for each number set. (4 points)
a) (25−−√, 9, −−−√64−−√)
b) ( -2.4, 0, 3.1, 81−−√)
c) (−23, 79, π2)
d) (12−−√, 11−−√, π)
only rational numbers
only irrational numbers
both rational and irrational numbers
a) only irrational numbers
b) both rational and irrational numbers
c) only rational numbers
d) only irrational numbers