Translate the following English phrase to mathematical phrase

Answer:
1.8+x
2.12<b
3.5x
4?
5.15-xy
6.a÷2
7.2+a+3+a
8.2(p+q+r)
9.m-ab
10.?
11.4-(s)
12.m>x-2
13.2(2×+4)
14.2+x+c
15.?