week one : $17$ units, $$26$ total etching costWeek two : $11$ units, $$20$ total etching costWeek three : $13$ units, $$24$ total etching costWeek four : $12$ units, $$22$ total etching costWeek five : $14$ units, $$25$ total etching costWeek six : $17$ units, $$28$ total etching cost$1.$ Calculate the fixed etching cost per week$2.$ Calculate the variable etching cost per unit$3.$ Express these estimates in the form of Y equals MX plus B$4.$ Calculate the total etching cost