Please help me solve the problem below. Professor provided answer but I do not know how to solve.

Answers are :Day 5 Forecasts = 1.2416, Day 7 Forecasts = 1.2637, and Day 10 Forecasts = 1.3006

I do not need answers, I need clear steps shown with math step-by-step. Please do not just give me formula. If you want, please use TI-84, but anything is fine.

Averaging Methods -What is the simple average forecast for Day 5 ? - What is the 3-day moving average forecast for day 7 ? - What is the 3-day weighted average forecast for day 10 assuming that the weight given for the most recent day is .6; day prior to that, .3; and day prior to that, .1