ACT 2017 December(A10) Math Question 15 Explanation - ACT Helper

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2017 December(A10) Math Question 15
Word Problems
- Addition & Subtraction
Choice E
$4 [\begin{matrix} - 1 & 2 \\ 0 & - 4 \end{matrix}] = [\begin{matrix} - 1 \times 4 & 2 \times 4 \\ 0 \times 4 & - 4 \times 4 \end{matrix}] = [\begin{matrix} - 4 & 8 \\ 0 & - 16 \end{matrix}]$
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