AlgebraEasy–MediumInequality for a delivery window
Algebra practice question
A parcel will arrive at a time t, in hours after midnight, that is no earlier than 9 and before 13. Which inequality represents the possible values of t?
- A. 9 ≤ t < 13Correct
- B. 9 < t ≤ 13
- C. 9 < t < 13
- D. 9 ≤ t ≤ 13
Answer: A. 9 ≤ t < 13
'No earlier than 9' includes 9; 'before 13' excludes 13.
Why the other answers are wrong
- B. 9 < t ≤ 13
- This excludes 9 and includes 13.
- C. 9 < t < 13
- This excludes 9.
- D. 9 ≤ t ≤ 13
- This includes 13.
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