Freight car loadings during an 18 -week period at a port are: a. Compute a linear trend line for freight car loadings. (Use of Excel's Trendline, with display Equation on chart option, is recommended). (Round the final answers to 3 decimal places.) a. Compute a linear, trend line for freight car loadings. (Use of Excel's Trendiline, with display Equation on chart option, is recommended). (Round the final answers to 3 decimal places.) Y= b. Use the trend equation to predict loadings for weeks 19 and 20 . (Round the final answers to 2 decimal places.) c. The manager intends to install w equipment when the volume reaches 770 loadings per week. Assuming the current trend continues, the loading volume will reach that level in approximately what week? (Round the final answer to the nearest whole week Approximate week to reach level