Answer:
a) If the diameter is 400 feet wide, then the radius is half that, which is 200 feet wide.
b) The circumfernce is π times the diameter, which is 400 feet. 400×π≈1256.64
c) She is not correct. She squared 400, which is 160000, when she should have squared 200, which is 40000. Then, multiply by π. 
40000 × π ≈ 125663.7
 
        
             
        
        
        
2 to the 2nd power times 3 to the second power times 5 
4 X 9 X 5 = 36 X 5 = 180
so the answer is 180 
hope this helps
        
             
        
        
        
Well both the hundred places are different so u would know that comparing it would be that the 738 is bigger than 645
        
             
        
        
        
Answer:
thank you so much........
 
        
                    
             
        
        
        
Answer:
they are all even numbers except for 155
Step-by-step explanation: