Answer:
|x - 89| ≤ 5
Step-by-step explanation:
Here the range is 84 to 94 ft, with the midpoint being 89 and the greatest variation from the midpoint being ±5.
We adapt |x| ≤ a as follows: replace x with 'x - 89' and a with 5:
|x - 89| ≤ 5
It is customary to regard '89' as the 'center' of the solution interval and 5 as the 'maximum difference' or 'radius' separating x from this center.
