Freight car loadings over an 18-week period at a busy port are as follows: Week Number 330 Week 2 Week 13 9 358 340 Number 325 425 475 455 515 565 4 Number 57 525 595 685 615 18 35e 355 15 16 17 18 11 12 625 Click here for the Excell Data file o. Determine a linear trend line for expected freight car loadings. (Round your Intermediate calculations and finet answers to 2 decimal places.) b. Use the above trend equation to predict expected loadings for Weeks 20 & 21. (Round your final answers to 2 decimal places.) The located demand for Week 20 is and for Week 21 c. The manager intends to install new equipment when the volume exceeds 910 loadings per week. Assuming the current trend continues, in which week (at the earliest) should the loading volume reach that level? (Ure the rounded answers, as required, from any previous part of this problem. Do not round any other Intermediate calculations. Round your final answer to 2 decimal places.) It should reach 910 loadings in Week