Problem: Which of these four numbers Ο2β,3.8β,4.00016β,3β1ββ
(.09)β1β, is (are) rational;
Answer Choices:
A. none
B. all
C. the first and fourth
D. only the fourth
E. only the first
Solution:
Ο2β=Ο, irrational
3.8β=38/10β=310β2β, irrational
4.00016β=416Γ10β5β=2β
10β1410β1β, irrational
3β1ββ
(.09)β1β=β1β
.31β, rational