can you please solve A, B, and C with formulas

10. A cosmetics manufacturer's marketing department has analyzed sales from last 10 years of its popular Hand \& Foot Cream product. In table 1 below, you will see these sales analyzed per week, during a period of 8 weeks. In table 2 , you will see the sales forecasted using a linear regression formula that they got from table 1 's data. a. Find the linear regression formula. b. Predict Sales for week 18 th using this linear regression equation. c. Could you find value 3 (in red) in table 1 ? You will be able to find this value only if you take into account that in class we have seen three different ways of calculating a linear regression. Keep in mind that these values are real values