Please help solving the question4a b

If it is possible, please give me a detailed explanation.Thank you such!

Question 4 A pharmacist has been monitoring sales of a certain over-the-counter pain reliever. Monthly sales during the last 15 months were: Month Number sold Month Number sold Month Number sold 36 38 w 13 44 14 u 48 10 15 a. Using 3-Month Weighted Moving Average using 0.2, 0.3, and 0.5 with the heaviest weights applied to the most recent months, develop forecasts for months from 11 to 16. b. Using Exponential Smoothing using an a=0.4 and the 10th Month forecast of 50, develop forecasts for months from 11 to 16