Identify the MOST SPECIFIC set to which each of the following numbers belongs.(7 points)
0.121212...
47−−√
144−−√
0
-9
words:
irrational number
whole number
natural number
rational number
integer
0.121212... - rational number
47−−√ - irrational number
144−−√ - whole number
0 - whole number
-9 - integer