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No. A16 is a relative address. To be an absolute address it would be $A$16.
No. A10 is a relative reference. $A$10 would be an absolute reference. As a relative reference, it will change when a formula is copied. An absolute reference will not changed in a formula when it is copied.
It would be a formula that includes absolute references in cells. When such a formula is copied, those cell references will not change. An absolute cell reference includes cell references with two dollar signs in them, like: $A$2.
C6 is a relative reference. $C$6 would be an absolute reference. As a relative reference, it will change when a formula is copied. An absolute reference will not changed in a formula when it is copied.
If you use relative address, the formula would be =D1+D3. If you used absolute references, the formula would be =$B$1+$B$3.
An absolute reference would be the normal type to use: =B2*$A$2 However, if your formula is being copied down a column, it would be sufficient to use a mixed address in this form: =B2*A$2 In the same way, if your formula is being copied across a row, this form of mixed address will work: =B2*$A2 In either of those last two scenarios, people still tend to use an absolute address anyway and that usually works perfectly.
Normally it would be a relative address, but depending on what you want to do with the formula, you could have it as an absolute or mixed cell reference. If the cell reference is the same as the cell that the formula is in, you will have a circular reference.
A formula containing a relative cell address looks to different cells based on a relative position to the cell containing the formula. So, if you had a formula in cell B1 which included the information from relative cell address A1, that formula, when copied to another cell will always look for the information in the cell directly to it's left on the same row. Copy that formula to B2 and the formula will use the information from A2...copy the formula to T64 and the formula will use S64. A formula containing an absolute cell address will always look to the exact same cell regardless of where you copy the formula. So if the formula in B1 contained absolute cell address A1, that formula will always look to A1, whether you copy it to B2 or T64. You can also have an address which is part relative and part absolute - so a formula will always look to a specific row but different columns (if the row is absolute and the column is relative), or the same column but different rows (if the column is absolute and the row is relative). So, if you wanted to use information contained along row 2 of each column, but the formula might be on different rows in different columns, you could make the row absolute and the column relative. so the formula in A7 would use A2, the same formula in B6 would use B2, the same formula in C26 would use C2.
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A Symbolic Address is a name invented by the programmer to identify a location. Without this idea the programmer would have to use absolute addresses, which are in binary.
Use the function ABS. =ABS(-11) returns the value 11.
=B16 would be a relative reference =$B$16 would be an absolute reference. you can also highlight the cell reference and press F4 to add the "$" signs around the reference.