How are the number of columns calculated

When copying and pasting text, the first step is move your cursor type the text select the copy command select the paste command

Amedian in the road will be marked with a white sign that has a black arrow going to the left of the median. true false

Jason works as an accountant in a department store. he needs to keep a daily record of all the invoices issued by the store. which file naming convention would him the most? a)give the file a unique name b)name the file in yymmdd format c)use descriptive name while naming the files d)use capital letters while naming the file