Hi,

sum of the arithmetic sequence 2, 4, 6, 8, ..., 70. 

to Apply**** 

I. determine d= 2 and n = 35 |note:  70 =  as 

II. Substitute values found into  to find Sum requested

  Do calculation

14, 8, 2,...; n=9  same as above Steps





sum of the geometric sequence -1, 11, -121, ...; n = 9 

to Apply****

I.  determine r and n

II.  Substitute into Formula

Recommend Posting the Geomteric Sequences separately 

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