Respuesta :

jailynnfigueroa

Answer:

If your just adding and finding the sum it would be 58

Step-by-step explanation:

1+2+5=8

8+8=16

16+11=27

27+14=41

41+17=58

Answer:

               S₇  = 16

Step-by-step explanation:

First term = -1

common difference d  = 3 ; n = 7

The sum of first n terms Sₙ = 2 a + (n - 1) d

                     S₇ = 2 × -1 + ( 7 -1 ) 3

                          = - 2 +( 6 × 3)

                          = - 2 + 18

                         = 16

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