Answer:
-36
Step-by-step explanation:
The applicable rule of exponents is ...
... (a^b)^c = a^(b·c)
Here, you have a=m, b=?, c=1/3, b·c = -12, so you can write ...
... b·(1/3) = -12
Multiply by 3.
... b = -36
The exponent of m inside parentheses is -36.
