Identify the most specific set to which each of the following numbers belongs:(5 points)

Question

0
0.121212...
47−−√
-9
144−−−√

irrational number
whole number
natural number
rational number
integer

Answer 1

0: whole number, natural number, integer
0.121212...: rational number
47−−√: rational number
-9: whole number, integer
144−−−√: irrational number