Answer:
i would say b 
Step-by-step explanation: if they all slept 4 hours a night then all 9 would have a total of 36 and a night would be 1 so 36 to 1
 
        
             
        
        
        
There are 32,760 different orders for the first four positions.
This is a permutation where repetition is not allowed; the formula for that is:

For our problem, we have:
 
 
        
        
        
Answer:
B
Step-by-step explanation:
angles on the circumference of a circle subtended on the same arc are congruent , then
x = 52°
 
        
                    
             
        
        
        
Answer:
I can't help you, it doesn't indicate what you need