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Determinants of Matrices

ACTMAT-F11Y4E

What is the determinant of matrix A, if:

$$ A = \begin{bmatrix} 3 & 8 \\\ 2 & 4 \end{bmatrix} $$

A

$4$

B

$-4$

C

$28$

D

$-28$

E

$16$