So you should multiply everything by 6. Your equation should look like this now b-132=126. Then add 132 to -126 and get b= 6.
the answer to your question is B.) Tense
Treatment of groups of workers
The first is correct as chronological order and that means by date. The Missouri Compromise, was in 1820, the "popular sovereignty, was in 1854, and the Dred Scott decision was handed down in 1857. Hope this helps!