answers finding limits algebraically

1:12
2:pi
3:8
4:54
5: -1
6:11
7:4/3
8:0
9:2
10:8
11:12
12:0
13: 4/-5
14: skip
15: DNE
16: DNE
17: DNE
18: DNE
19: +inf
20: +inf
21: -inf
22:DNE
23: DNE
24: DNE
25: 1/4
26: 0
27: +/- 4
28: 6
29: -inf
30: +inf
31: 1/2
32: -3/2
33: 0
34: 0
35: +inf
36: +inf
37: 1
38: 1
39: 0
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