Answer:
15.33cm
Step-by-step explanation:
when you try to draw out this figure, satisfying the fact that Ad and Ac are both straight lines. you find the ultimately  it forms a right-angled triangle with sides AC and AD and hypotenuse CD. 
Now, you may use Pythagoras theorem to solve:
AC^2 + AD^2 = CD^2
12.3^2 + 9.15^2 = CD^2
CD^2 = 235.0125
CD = square root of 235.0125 = 15.33cm
Hope this helps
 
        
             
        
        
        
Answer:
4n
Step-by-step explanation:
It's basically like 4 times n which equals 4×n
 
        
                    
             
        
        
        
Answer:
B. <1 and <5
Step-by-step explanation:
they look exactly the same
 
        
                    
             
        
        
        
For every one stamp James has Roy has twice as much. So the ratio would be 1/2. Hope this helped!