What is the determinant of cap m is equal to the 2 by 2 matrix, row 1, column 1, 5 column 2, negative 5 row 2, column 1, 8 column 2, 4 ?

For a 2 by 2 matrix [ a b; c d ], the determinant is ad − bc. Here, that is (5 × 4) − (−5 × 8) = 20 − (−40) = 60. The determinant is 60, choice C.

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