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2.1a Explain why spreadsheet formulas are used** What is the main reason given, and the main occasion, for using formulas in spreadsheets? In what situations, and for what specific advantage, is it recommended to use formulas in spreadsheets, when entering the numbers might sometimes be just as convenient? -Give two reasons why it is considered better to write formulas for sums, averages, and so forth, in spreadsheets, rather than type in all the numbers. 2.2a Explain or use relative and absolute cell referencing* - If the formula "SBS2+C2" is copied from cell D2 to D3, what will the new formula be? What is the principle behind what happens? - When is a range used in a spreadsheet? What exactly does "-budget!C6" refer to, and how does it copy