Question

D(n)=-5(1/2)^n-1 what is the 3rd term in the sequence

Answer 1

-1.25

Explanation:

thats the answer on khan

Answer 2

-1.25

Explanation:

Better to write this as

a(n)= -5(1/2)^(n-1)

Then the 3rd term is a(3) = -5(1/2)^(3 - 1), or a(3) = -5(1/2)^2 = -5/4 = -1.25