Answer:
508.68
*sorry if this is late
Step-by-step explanation:
Divide 36 by 2 to get radius 
Multiply 18 by itself to get 324 
Multiply 324 by 3.14 to get the area of a circle 
Divide it by 2 to get the area of the semi circle 
 
        
             
        
        
        
I physically cannot tell you
        
                    
             
        
        
        
Answer:
40.25 if my math is right
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
8,000
Step-by-step explanation:
the nearest thousand is 8,000 as it is past 7,500.
 
        
                    
             
        
        
        
Answer:
a ) 7a + 12
b) b - 15
Step-by-step explanation:
a)2a+5a +8+8
= 7a + 12
b) b - 7 - 8 
= b-15