please answer cumulative forecast errors, MAD, and tracking signal

Passenger miles flown on Northeast Airlines, a commuter firm serving the Boston hub, are shown for the past 12 weel a) Assuming an initial forecast for week 1 of 16,000 miles, use exponential smoothing to compute miles for weeks 2 through 12. Use =0.18 (round your responses to two decimal places). b) The MAD for this model = thousand (round your response to two decimal places). c) Compute the Cumulative Forecast Errors, cumulative MAD in thousands, and tracking signals (round your responses to two decimal places)