Mathematics
OpenStudy (anonymous):

If y = -3 [-2 -1 4 -5 0] [-3 12 6 -8 -2] [1 5 -4 7 -6] which element is y(23) ? <------(23)represents a subscript

OpenStudy (anonymous):

$y _{2,3}$notates the 2nd row, 3rd column. So multiplying through by the -3 on the outside, you'd have $-3\times6=-18$

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