1. Determine a linear trend line for expected freight car loadings.
2. Use the above trend equation to predict expected loadings for Weeks 20 & 21.
3. The manager intends to install new equipment when the volume exceeds 920 loadings per week. Assuming the current trend continues, in which week (at the earliest) should the loading volume reach that level?

** Please show work so I can understand better**

Freight car loadings over an 18-week period at a busy port are as follows