Tell whether each number is an element of N (a natural number), Z (an integer), Q (a rational number), Q´ (an irrational number), or R (a real number). Since these sets are not all disjoint, you may need to list more than one set for each answer.

a. 19

b. 6.48

c. 1.868686868 . . .

d. √8

e. π

f. 0.001̅2̅

g. √16

h. √1,000

i. 1 / 7