If h=a^-3 and am=1 what does h^3 equal in terms of m?
The fact that am = 1 tells you that a and m are reciprocals. In other words, 
.
Since you know that 
, you know that 
.
You can use the fact that a and m are reciprocals to substitute:
.
So, 
.
If h=a^-3 and am=1 what does h^3 equal in terms of m?
The fact that am = 1 tells you that a and m are reciprocals. In other words, .
Since you know that , you know that .
You can use the fact that a and m are reciprocals to substitute:.
So, .