Question: How do I solve question B & C in excel ? please show me how to solve so i can do it for the next

How do I solve question B & C in excel ? please show me how to solve so i can do it for the next two. thank you.
B: in colum c (starting in the appropriate cell) write a formula using a built in excel function to forecast demand through October using an MA (3) model.
C: in colum d (starting in the appropriate cell) write a formula using a built in excel function to forecast demand through October using an MA (5) model.
month orders delivered
jan 120
feb 90
mar. 100
april 75
may 110
june 50
july 75
aug 130
sep 110
oct 90

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