i just need help with 5, 6 and 7 it has been an absolute struggle.

A portion of Leslie's operating information for the company's last year follows: Month January February March April May June July August September October November December Number of Jerseys Printed 215 195 230 550 675 655 455 375 319 23e 185 175 Operating Cost $5,835 5,685 5,930 8,575 9,770 9,260 6,230 6,175 6,005 5,960 4,960 4,800 Required: 3. Using the high-low method, calculate the store's total fixed operating costs and variable operating cost per jersey. 4. Using the high-low method results, calculate the store's expected operating cost if it printed 450 jerseys 5. Perform a least-squares regression analysis on Leslie's data. 6. Using the regression output, create a linear equation (y = a + bx) for estimating Leslie's operating costs. 7. Using the least-squares regression results, calculate the store's expected operating cost if it prints 640 Jerseys Complete this question by entering your answers in the tabs below. Required 3 Required 4 Required 5 Required 6 Required 7 Using the least squares regression results, calculate the store's expected operating cost if it prints 640 Jerseys. (Round your intermediate calculations and final answer to 2 decimal places.) Total Cou 8,965.92