Step-by-step explanation:
1) 
We know that, 

2) 
Again using above property,

3) 
We know that,

So,

4) 
Hence, this is the required solution.
La respuesta es 81.
Eso es porque
81*1= 81,
27*3=81,
y 9*9=81.
The solution must be larger than 9, because the answer is h=10