Question

HELP Q&As

Which of the following is the formula for the geometric sequence?
8, -16, 32, -64,...
an = 8(-2)n-1
an = 2(-8)n-1
an = -8(2)n-1
This sequence is geometric. What is the next term? 500, 250, 125, 62.5,...
31.25
12.5
25
The formula for a geometric sequence is an = 2(4)n-1. What is the third term of the sequence?
24
32
16

Answer 1

first
an = -8(2)n-1
second
31.25
third
32