Explain me each answer and how I can get it. I want to learn so please teach me how to do it and show your procedures. Big LIKE will be given!

This exercise contains only parts a,b, and c. a) Using a 2-month moving average, the forecast for periods 11 and 12 is (round your responses to two decimal places): b) Using a 3-month moving average, the forecast for periods 11 and 12 is (round your responses to two decimal places): c) The mean absolute deviation based on a 2-month moving average of March through December is $0.119 (round your response to three decimal places). The mean absolute deviation based on a 3-month moving average of April through December is : (round your response to three decimal places)