Need algebra help with the Sum of the first n terms of an geometric sequence

Algebra
Tutor: None Selected Time limit: 1 Day

Dec 18th, 2015

Thank you for the opportunity to help you with your question!

1)sum=5*(1+3+9+27+81+243+729+2187)

=5*3280

sum=16400

2)a(1-r^n)/1-r

=-1/4(1-(1/4)^9)/1-(1/4)

simplify

sum= -52429/262144

Please let me know if you need any clarification. I'm always happy to answer your questions.
Dec 18th, 2015

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