Here's a link to your answer
https://web2.0calc.com/questions/sequence_38
Here's a answer to your question:
https://web2.0calc.com/questions/quadratics_17
Here's a link to your answer:
https://web2.0calc.com/questions/help-please_82361
Here's the link to the same problem that's been answered:
https://web2.0calc.com/questions/geometric-sequence_26
Thank you so much CPhill! I think the answer is 41/3+4/3=45/3 which is equivilent to 15.