On the first part, just replace the variables with the given number to check.
1) 34 + 12 = 46 → Correct
2) 22 - 9 = 14 → Incorrect
3) 6 * 9 = 54 → Correct
4) 39 ^ 3 = 13 → Correct
On the second part, simply change the symbols. Like this:
5) 7 + k = 11 ⇒ 11 - 9 = k
K = 2
6) p - 24 = 13 ⇒ 13 + 24 = p
p = 37
7) b - 16 = 7 ⇒ 7 + 16 = b
b = 23
8)
+ m =
⇒
-
= m
m = 13/30
Hope this helps!