Question

The ideal length of a particular metal rod is 20.5 cm. the measured length may vary from the ideal length by at most 0.045 cm. what is the range of acceptable lengths for the rod?

A) 20.455 ≥ x ≥ 20.545
B) 20.455 ≤ x ≤ 20.545
C) x ≤ 20.455 or x ≥ 20.545
D) 20.455 ≥ x ≤ 20.545

Answer 1

The minimum range = 20.5 - 0.045 = 20.455
The maximum range = 20.5 + 0.045 = 20.545

The range is between 20.455 and 20.545
Writing this as inequality
20.455 ≤ x ≤ 20.545

Correct answer: B