There is no way to determine that without knowing how many salaries you what to list on the spreadsheet.
No. Rows are identified by numbers in a spreadsheet. Columns are identified by letters.
Rows
No. A spreadsheet grid is made of rows and columns, not diagonals.
=AVERAGE(D4:D20) or =AVERAGE(D5:D19), depending on what you mean by "between rows"
there are an infinite number of columns and row in a spreadsheet
collection of rows and columns
They are called rows and rows are numbered.
It is called a spreadsheet or a worksheet.
It can be a table, or a spreadsheet.
row
You can display or print as many rows and columns as you like. Change your view percent or select only a specific range to print. You can not change the number of columns and rows available in the spreadsheet. You also can use grid lines and borders to highlight the areas you want to use.
A worksheet consists of columns and rows, making up cells.