Here are the answers:
1. B
Work:
5 + ( 2 + 3^2) - 1
5 + ( 11 ) - 1
16 - 1 = 15
2. E
Work:
6n = 102
6 x 102 = 612
3. D
Work:
4(9) - 12
36 - 12 = 24
4. A
Work:
3^1 + 2^4
3 + 16 = 19
5. A (I’m not sure)
I tried my best. But this is what I got as my answer, and I doubled checked.