Answer:
a. -0.1 < x - 10 < 0.1
b. 9.9 < x < 10.1
c. see attached image
d. Long bolts must fall within margin of error of less than 0.1 so it can be any length greater than 9.9 mm and less than 10.1 mm.
Step-by-step explanation:
-0.1 < x - 10 < 0.1
-0.1 < x - 10 and x - 10 < 0.1
9.9 < x x < 10.1
Can be written as 9.9 < x < 10.1
