Answer:
r = 21
Step-by-step explanation:
nth of sequence P :

 :
 : 
 
        
             
        
        
        
Answer:
7.11 -7.1
-7.1
Step-by-step explanation:
 
        
                    
             
        
        
        
18 - 22 + 5x(66:3)
= 18 - 22 + 5x22
= -4 + 110
= 77 
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For the first 60 positive integers, a = 1, n = 60, l = 60.
Sn = n/2(a + l)
s = 60/2(1 + 60) = 30(61)
For the next 60 positive integer, a = 61, n = 60, l = 120
Sum = 60/2(61 + 120) = 30(61 + 120) = 30(61) + 30(120) = s + 3600
Sum of first 120 positive integers = s + s + 3600 = 2s + 3600
        
             
        
        
        
Answer: 12x+36
Step-by-step explanation:
If you use distributive property, 12 x X is 12x and 12 x 3 is 36 so you get 12x+36