help pls
1. 4n - 12
2. 3x + y
3. 11a + 6b - 2c
4. 2ttr²h
5. 15mn - 5n + 12
help pls I need your answer
![Help Pls1 4n 122 3x Y3 11a 6b 2c4 2ttrh5 15mn 5n 12help Pls I Need Your Answer class=](https://ph-static.z-dn.net/files/d63/e97634dfae64736a3c874a67343e5cde.jpg)