EM-2129

Scalar multiplication of matrices

E Math · Secondary 4 · Medium · Scalar multiplication of matrices

A bakery records the number of loaves sold in three shops on a weekday using matrix

L = \begin{pmatrix} 15 & 20 & 18 \\10 & 12 & 14 \end{pmatrix}

where the first row is white bread and the second row is wholemeal bread.

Find the matrix that represents the total number of loaves sold in 6 weekdays.

$\begin{pmatrix} 21 & 26 & 24 \\16 & 18 & 20 \end{pmatrix}$
$\begin{pmatrix} 90 & 120 & 108 \\60 & 72 & 84 \end{pmatrix}$
$\begin{pmatrix} 75 & 100 & 90 \\50 & 60 & 70 \end{pmatrix}$
$\begin{pmatrix} 30 & 40 & 36 \\20 & 24 & 28 \end{pmatrix}$

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