Which of the following?

Question

The first and third terms of an arithmetic sequence are -1 and 5, respectively. Which of the following is the sixth term? 

 

a) -25

b) 11

c) 14

d) 29

e) 3125

 

Please show all your work.

Answer 1

-1    ?    5    ?    ?    ?

 

[5-(-1)]/2=6/2=3 (add 3)

 

-1    2    5    8    11    14

 

c) is the answer

Answer 2

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