Cosine is transformed in the form:

The amplitude is a
The period of cosine is:

And the phase shift is always by c, so that means our transformed functon in the form mentioned above looks like:

So our period is 
Our phase shift is by  units to the right
 units to the right
and our amplitude is 3.
 
        
             
        
        
        
It has multiple functions but it should be close to the middle
        
             
        
        
        
10 x 10 = 100
 20 + 20 + 20 + 20 +20 = 100
4 x 25 = 100