Question

Find the sum of the first 5 terms of the geometric sequence
5, 15, 45, 135

Answer 1

do you have choices

Answer 2

no:(

Answer 3

In a geometric sequence, you find the next number by multiplying. So 5 x what is 15 ?
15 x what is 45 ? We need to find the common ratio

Answer 4

so its 3?

Answer 5

its 405

Answer 6

3 is the common ratio. So to find the next number, you multiply by 3. The next number would be 135 x 3 ?

Answer 7

yes...its 405

Answer 8

and if you needed the next number, it would be 405 x 3