allerySolve 3 ≤ 2x - 1 ≤ 7 (a DOUBLE inequality) for real x.
A-1 ≤ x ≤ 3
B2 < x < 4
C2 ≤ x ≤ 4
D1 ≤ x ≤ 5
Answer & Solution
Correct answer: C. 2 ≤ x ≤ 4
Add 1 throughout: 4 ≤ 2x ≤ 8
→ divide by 2 (positive, no sign flip): 2 ≤ x ≤ 4. Solution set [2, 4].
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