Question

What character must always used when a formula is entered into a cell​

Answer 1

An equal sign is the first character you type when entering a formula into a cell of a spreadsheet.

For instance, if you want to find the sum of values from A1 to A4 (so we want to add up A1,A2,A3,A4) we would type
`=\text{SUM(A1:A4)}` into some other cell. The colon indicates we're adding cells in between A1 and A4.