Digital ACT Math Practice Question #1239
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
First entry: $2(5) + (-1)(-2) = 12$. Only Choice A and E have 12. Dimensions are $2 \times 1$, so Choice A is immediate.
A $2 \times 2$ matrix multiplied by a $2 \times 1$ matrix produces a $2 \times 1$ matrix. Row 1: $(2)(5) + (-1)(-2) = 10 + 2 = 12$. Row 2: $(3)(5) + (4)(-2) = 15 - 8 = 7$. The product is $\begin{bmatrix} 12 \\ 7 \end{bmatrix}$....
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