Ineed alot of finshing this math questions

For #7, the distributive property was used because (6-4x) was multiplied by 3 to get (18-12x).

For #8, first you move the 19 to the other side.
e+19=-19
   -19=-19
e=-38
Since you move 19 to the other side, it changes to -19 and you do -19-19 which equals -38.

1.3 and 1 1/3 are both closest to 1. hope this ; )