not sure if my answers are right...but yea...
1.b
2.d
3.c<----the answer is to3 s.f......(ans=1.8276....to 3s.f is 1.828, m i right?)
4.a
5.d
6.c
7.d
8.b
9.c
10.c
11.b
12.c
13.c
14.b
15.d
16.d
17.b
18.b<--should be worng...
19.c<--not sure...
20.a
21.b
22.d