Freight car loadings over an 18-week period at a busy port are as follows: Week Number Week Number Week Number 1 380 7 450 13 655 2 385 8 500 14 665 3 390 9 550 15 715 4 385 10 545 16 720 5 390 11 595 17 725 6 400 12 645 18 730 a. Determine a linear trend line for expected freight car loadings. (Round your intermediate calculations and final answers to 2 decimal places.) 1formula110.mml = + t b. Use the above trend equation to predict expected loadings for Weeks 20 & 21. (Round your final answers to 2 decimal places.) The forecasted demand for Week 20 is and for Week 21 is . c. The manager intends to install new equipment when the volume exceeds 960 loadings per week. Assuming the current trend continues, in which week (at the earliest) should the loading volume reach that level? (Use 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 960 loadings in Week .