Need help from a Google Sheets Expert -- 2

Job ID: 34151215

Budget: $10 – $30 USD

I have a small assignment...there are 2 years of quarterly data from 2013-2015. I need to give some estimates for 2016 Q1. I have the data in a google sheet doc already but Im unable to get the forecasting function to work. This shouldn't take a long time but let me know if you can help. Ill attach screenshot of the questions to answer.
Related categories: Excel Google Sheets