Exponential Smoothing with Trend

$\backslash$table$[[$Week$,$Sales,Level,Trend,Forecast$],[,,,,],[0,56,,,],[1,59,,,],[2,53,,,],[3,60,,,],[4,63,,,],[5,,,,],[6,,,,]]$

Fill in the yellow boxes with the appropriate constants and formulas

The following data are for computer sales in units at an electronics store over the past froe weeks:

$\backslash$table$[[$WEEK$,$DEMAND$],[1,56],[2,59],[3,53],[4,60],[5,63]]$

Ise trend$-$adjusted exponential smoothing with $a=0\mathrm{.}2$ and $=0\mathrm{.}2$ to forecast sales for weeks $3$ through $6.$ Assume that the smoothed average is $55$ units and that the average trend was $+6$ units per week just before week $1..$