Question

Matrices { 1 3 8 5 } {5 4 6 2} {6 7 1 8} {2 9 3 7} a22=

Answer 1

Answer: 4

`a_(22)` means "look at the 2nd row and 2nd column". The value found here is 4

Another example:
`a_(34)` means "look row 3, column 4" and the found there is 8. The row number is always listed first.