This information in incomplete hence the general answer. The question is related to the use of Ezcel Work Sheet to solve problems.
The key tasks stated are:
To insert a column, you'd need to right-click on the headers of the column after the information provided where you have the alphabetical labels such as A, B, C, etc....on the drop-down list, you'd find an option "insert".
To name the Column simply click on the first cell on top of the new column and type the name "Years", then press the "Enter" key.
To insert a formula, first you must click on the cell where you want the formula. Next, insert the "equal to" sign (=), then type your formula. In this case, the formula is = 2022-2021. Or If the year referenced is already in a cell on the worksheet, just type "= (name of cell) - 2021", then press the "Enter" key.
In order to clear formatting, under the "Home" tab, select "Conditional formatting". You will see a list that contains "Clear Rules". Select it to clear all conditional formatting from the entire sheet or the selected cell.
See the link below for more about Worksheets:
https://brainly.com/question/25487186