How could you insert a new row between rows 20 and 21?

To insert a new row between 20 and 21 - Right-click row 21's row number, and then click Insert.The general rule for inserting a column is: select the column, select Home > Insert >  Insert Sheet Columns. Using the keyboard you can do the following: With a single cell selected, hit Control + Shift + + (Plus Sign) to insert a row.

the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)