I been struggling with this subject. so i been practicing with few non-graded questions and still kept getting errors so can you show me how to proceed from A to Z so i can see what i did wrong please? i did copy and paste so you can see what i am seeing.

i screen shot and attached the whole question- you could see i did put two answers, but please check if it is correct or wrong (if wrong show me how to get to right answer.

Mr. James McWhinney, president of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales. To document this assertion, Mr. McWhinney gathered the following sample information. The x column indicates the number of client contacts last month and the y column shows the value of sales ($ thousands) last month for each client sampled. Number of Sales ($ Number of Sales ($ Contacts , X thousands ) , y Contacts , x thousands ) , y 14 24 23 30 12 14 48 90 20 28 50 85 16 30 55 120 46 80 50 110 Click here for the Excel Data File a. Determine the regression equation. (Negative values should be indicated by a minus sign. Do not round intermediate calculations. Round final answers to 2 decimal places.) y = -12.2 + 2.20 x b. Determine the estimated sales if 40 contacts are made. (Do not round intermediate calculations. Round final answers to 2 decimal places.) The estimated sales