Answer:
A
Step-by-step explanation:
Given
21 ≤ - 3(x - 4) < 30 ← divide all 3 intervals by - 3
Remembering to reverse the direction of the signs as a result of dividing by a negative quantity
- 7 ≥ x - 4 > - 10 ← add 4 to each interval
- 3 ≥ x > - 6, that is
- 6 < x ≤ - 3 → A
