1C
2A
3B
4B
5B
6C
7C
8C
9B
10A
1D
2B
3B
4B
5C
(1-2x)(1+2x)
A
1too
2either
3either
4either
5too
6too
1C
2A
3D
4D
5D
6A
7B
8A