Which best describes the solution set of the compound inequality below? 2 + x ≤ 3x – 6 ≤ 12
a. 4 ≤ x ≤ 9
b. 4 ≤ x ≤ 6
c. –2 ≤ x ≤ 2
d. –2 ≤ x ≤ 3

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.