Respuesta :

s3629452
I think this question belongs in the maths section but you put  it in the geography section.

Anyways these are the steps to answering the problem:
1. 2*2*2*2=16
2. 3*4=12
3. 16-12=4
4. 16+4=20
The answer is 20.
Hope I helped!!! :)