Ok this is a pretty easy one. 
2=22
3=20
4=18
        
                    
             
        
        
        
X=16
I use Tiger Algebra for help and it gives me all the correct work and answers as i need them!! TRY USING IT TODAY!!!!! 
        
             
        
        
        
It is false that deserts advance linearly, in easily mappable patterns.
Deserts don't really have a pattern when they are advancing - there are so many ways they can do this. 
        
                    
             
        
        
        
5
you use the formula a^2+b^2=c^2
a=3, b=4
3*3=9 and 4*4=16
16+9=25
square root of 25 is 5.
5 is the answer
        
                    
             
        
        
        
Divide total km by the km in the scale:
112 / 16 = 7
The answer is A. 7 cm