Please help me i only have 20 min in exam i gonna fail Please help me

Invigilator Plus Week Sale ($) Streaming N m 102 105 112 105 4 a. Use a four-week moving average to develop a forecast for week 8. (2 marks) b. Use exponential smoothing with a smoothing constant of a=0.6 to develop a forecast for week 8. (6 marks) (Do the analysis in Excel sheet , copy the results and paste here and provide explanations) c. Which of the two methods do you prefer and why