I have no idea what you mean by "change a row". If you swap two rows in a determinant, then that multiplies the determinant by -1. So if you swap two rowsandmultiply by -1, that does not change the determinant.

Dividing (multiplying) a row by a constant multiplies (divides) the entire determinant by that constant so to keep the same determinant, do the opposite: if you multiply a row by a constant and divide the determinant by the same constant you do not change the determinant.2)if we divide a row by a constant what do i do to get the right answer for the determinant?

No, "column operations" do exactly the same thing as row operations:3) column operations do not affect the determinant

Multiplying a roworcolumn by a number multiplies the entire determinant by that number.

Swapping two rowsorcolumns multiplies the entire determinant by -1.

Adding a multiple of one roworcolumn to another does not change the value of the determinant.