Please answer 3,4,5,6,7

Leslie Sporting Goods is a locally owned store that specializes in printing team jerseys. The majority of its business comes from orders for various local teams and organizations. While Leslie's prints everything from bowling team jerseys to fraternity/sorority apparel to special event shirts, summer league baseball and softball team jerseys are the company's biggest source of revenue. A portion of Leslie's operating Information for the company's last year follows: Number of Month Jerseys Printed January 185 February 205 March 195 April 510 Hay 615 June 685 July 435 August 325 September 380 October 265 November 260 December 190 Operating Cost $4,870 5,830 5,735 8,665 9,250 9,730 6,250 6,030 6,175 5,970 5,925 4.945 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 420 jerseys. 5. Perform a least squares regression analysis on Loslle's data. 6. Using the regression output, create a linear equation Va+b) for estimating Leslie's operating costs 7. Using the least-squares regression results, calculate the store's expected operating cost if it prints 650 jerseys