Answer:
12
Step-by-step explanation:
if you combine the triangles (1/2) you get 6 since they are 0.5 of a unit divide by two = 3 add to 9 =12
 
        
             
        
        
        
Answer:
15 years and 8 months
Step-by-step explanation:
I used the formula for compound interest as shown below and solved for the unknown, time. 
Since our interest is compounded annually (So once a year) our m value is 1.
 
        
             
        
        
        
The area of the shaded region is 85 units cubed.
        
                    
             
        
        
        
Hahah what you learning...............