Answer:
1. The mistake he made was in Step #2. He subtracted 10 from -6 and 10 but he didn't subtract 10 from 18.
2. The correct answer should be -16 ≤ x < 8
Hope this helps : )
Explanation:
Whatever you do on one side of an inequality/equation, you must do the same thing to the other side(s).
To get the correct answer he must subtract 10 from 18 which equals 8.
The final compound inequality is -16 ≤ x < 8