Answer:
compound inequality: 80 ≤ (82 +88 +q)/3 ≤ 85
solution: 70 ≤ q ≤ 85
Step-by-step explanation:
Let q represent Jackie's final quiz score. To achieve her desired average, q must satisfy ...
... 80 ≤ (82 +88 +q)/3 ≤ 85
We can multiply by 3, then subtract the constant in the middle.
... 240 ≤ 170 +q ≤ 255
... 70 ≤ q ≤ 85
