Question

Please Help?:)

Answer 1

What is the sum of an 8-term geometric sequence if the first term is 10 and the last term is 781,250?

Answer 2

976,560.

Answer 3

Do you have multiple choice answers?

Answer 4

Thanks, but I'd actually like to know the formula so I could solve it. No it's a written response

Answer 5

a = 10
ar^7 = 781250
r^7 = 781250 / 10 = 78125
r = 5
10 ((5^8 - 1) / (5 - 1))
=976,560

Answer 6

Thanks girly:)

Answer 7

Did i explain it well enough?

Answer 8

or does that show you enough?

Answer 9

It's enough thanks:)