+0  
 
0
47
1
avatar

Find the 139th term of the arithmetic sequence whose first term is -28 and the common difference is 1/3

 Apr 10, 2020
 #1
avatar+111329 
+2

a139 =  a1  + d ( n  -1)

 

 

So we have

 

a139 =  -28  - (1/3) ( n - 1)

 

a139  = -28 - (1/3)(139) + 1/3   =  -28 - 139/3 + 1/3  =  -28   -  138/3  =  -28 - 46  =  - 74

 

 

 

cool cool cool

 Apr 10, 2020

24 Online Users

avatar