1 of 8 0-day streak

Use matrix multiplication to answer an application question

Question 1 of 8

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Matrices \(A\) and \(B\) describe small items sold at school book-fair desks. The columns of \(A\) and the rows of \(B\) use the same item type order

A: Items sold

Rows, in order: Entry desk, Fiction desk

Columns, in order: Bookmarks, Postcards

A = \begin{bmatrix} 4 & 4 \\ 2 & 1 \end{bmatrix}

B: value for one unit of each item type

Rows, in order: Bookmarks, Postcards

Columns, in order: Sales value

B = \begin{bmatrix} \$1.15 \\ \$1.53 \end{bmatrix}