Find the error intervals for the following truncated numbers

Question 1:

28 (2 s.f.)
28≤x<29

Question 2:

450 (3 s.f.)
450≤x<451

Question 3:

0.004 (1 s.f.)
0.004≤x<0.005

Question 4:

0.000109 (3 s.f.)
0.000109≤x<0.00011