I need help with an algebra problem

Algebra
Tutor: None Selected Time limit: 1 Day

Dec 5th, 2015

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

1) s5 = a1(1-q^n)/(1-q)  = 1/3*(1-(1/3)^5)/(2/3) 

=1/3*(1-1/243)*3/2

=1/2 *(242/243)

=121/243

2) s9 = a1(1-q^9)/(1-q) = 2*(-4)*(1-(-4)^9)/5 =-8*(1+4^9)/5

=-419432

Please let me know if you need any clarification. I'm always happy to answer your questions.
Dec 5th, 2015

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