Ask
your own question, for FREE!

Mathematics

OpenStudy (anonymous):

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

Still Need Help?

Join the QuestionCove community and study together with friends!

OpenStudy (anonymous):

ok im really not sure since i did it last year but i think that u need to find common ratio. 781,250=10*r^7. take the 7th root so r=5. from there use ur geometric formula. 10(1-5^8) take ans divide by -4. ans=976560

OpenStudy (anonymous):

goemtric formula summation= 1st term * 1-common ratio^nth. take ans divide by 1-common ratio.

Can't find your answer?
Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!

Join our real-time social learning platform and learn together with your friends!

Latest Questions

terrance121705:
Which molecule contains the fewest number of atoms? (2 points) a SmCl3 b RbNO3 c

1 minute ago
0 Replies
0 Medals

terrance121705:
A hot metal bowl is placed on a wooden table. Over time, the wood becomes warm. Which of these statements best describes why the table becomes warm? (2 poin

7 minutes ago
6 Replies
1 Medal

TurtlePrincess:
Explain some of the beneficial results of well-written sentences.

10 minutes ago
0 Replies
0 Medals

kekeman:
A writer presents the following claim and counterclaim: Claim: The school cafeteria should start a composting program Counterclaim: Composting is too messy

13 minutes ago
0 Replies
0 Medals