Question

Given the sequence in the table below, determine the sigma notation of the sum for term 4 through term 15. n an 1 5 2 −10 3 20

Answer 1

The answer to this would be 662.

Explanation:

Sigma notation calls for the sum of the terms in the sequence.

Answer 2

15

∑ 5(-2)^n-1

n =4

Explanation:

15 and n = 4 should be on top (15) and below (n = 4) of the ∑

hope this helps :]