Step-by-step explanation:
hope you get ur answer 
 
        
                    
             
        
        
        
First slot, 11 options
2nd is 10 (1 less than 1st slot)
3rd is 9
4th is 8 
11*10*9*8=7920 different pizzas (assuming you can't order all 1 topping)
        
             
        
        
        
361 + 173 =361+173 
(a+b)+(a-b)=361+173
a+b=a-b=534
2a=534
a=267
267+b=361
b=94 
the two numbers are 267 and 94
        
             
        
        
        
Let D = difference between mean and median of data.
Mean = (22 + 8 + 10 + 18 + 12 + 20)/6
Mean = 90/6
Mean = 15
Let m = median
m = 8, 10, 12, 18, 20, 22
m = (12 + 18)/2
m = 30/2
m = 15
D = M - m
D = 15n- 15
D = 0