+0  
 
-2
62
3
avatar+-291 

https://web2.0calc.com/questions/help-pls-counting-lists

 Apr 4, 2020
 #1
avatar+111329 
+2

The common difference  is   7

 

We  can solve this

 

48  = -36 + 7 ( n -1)      add 36 to both sides

 

84  = 7 ( n - 1)    divide both sides by 7

 

12 =  n - 1      add 1 to both sides

 

13  = n  = numbers in list

 

 

 

cool cool cool

 Apr 4, 2020
edited by CPhill  Apr 4, 2020

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