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16.12.2020 •
Mathematics
You are building a rock wall for a flower bed along your 46-foot long driveway. You want the wall to be one-half of the length of the driveway with an absolute deviation of at most 6 feet. Write and solve an absolute value inequality that represents the possible lengths of the wall.
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Ответ:
a. ║ x - 23 ║ ≤ 6 b. 17 ≤ x ≤ 29
Step-by-step explanation:
a. Let x be the length of the wall. Since the length of the wall is half the length of the drive way with an absolute deviation of 6 at most, since the drive way is 46 foot long, half of it is 46/2 = 23.
So, 23 ± 6 ≤ x or x - 23 ≤ ±6 or ║ x - 23 ║ ≤ 6
b. Solving the absolute value inequality,
-(x - 23) ≤ 6 and x - 23 ≤ 6
x - 23 ≥ 6 and x - 23 ≤ 6
x ≥ 23 - 6 and x ≤ 23 + 6
x ≥ 17 and x ≤ 29
So 17 ≤ x ≤ 29
Ответ: