Question

Need help math question asap, DOUBLE 12 POINTS!

Answer 1

The row is the first number in a13. Rows go across. So you are in the top row.

The 3 or second number is the column. Columns go up and down.

Row 1 column 3 is the - 1.

The answer is C.

Answer 2

The element $a_{13}$ is the entry in the 1st row and 3rd column of the matrix, which, in this case, is 7.

Edit: Got my rows/columns mixed up! Row 1, Column 3 is actually -1, as the original poster pointed out.